Answer:
[tex]\fbox{c = - 4.01 \: joule/g°C}[/tex]
Step by step explanation:
Given:
Mass of given sample (m) = 2.50 g
Initial temperature (T1) = 25°C
Final temperature (T2) = 20°C
Heat Energy Q = 12 cal
To find:
[tex]Specific \: Heat \: c = \: ?[/tex]
Solution:
We know that,
Specific heat of any substance is directly proportional to the mass and change in temperature.
Represented by equation,
[tex]Q = mc \triangle T[/tex]
Where,
Q = Heat Energy
m = mass of given sample
c = specific heat
∆T = change in temperature
Substituting corresponding values,
[tex]Q = mc \triangle T \\ 12 = 2.5\times c \times (20-25) \\ c = \frac{12}{2.5 \times ( - 5)} \\ c = - 0.96 \: cal/g°C \\ [/tex]
We also know that,
[tex]1 \: cal = 4.184 \: joules[/tex]
multiplying above answer by 4.184,
[tex]c = - 0.96 \times 4.184 \\ \fbox{c = - 4.01 \: joule/g°C}[/tex]
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Write the full electron configuration for phosphorus, atomic symbol P
Answer:
The electronic configuration for Phosphorus(P) is 1s2,2s2 2p6, 3s2 3p3
Will a precipitate form if you mix 75.0 mL of a NaOH solution with pOH of 2.58 if it is mixed with 125.0 mL of a 0.0018 M MgCl2 solution
A precipiatate of mass 0.013 g is formed when you mix 75.0 mL of a NaOH solution with pOH of 2.58 and 125.0 mL of a 0.0018 M MgCl2 solution
What is stoichiometry?In stoichiometry, calculations are made based on mass - mole or mole - volume relationships. First we must put down the balanced reaction equation; 2NaOH(aq) + MgCl2(aq) -----> Mg(OH)2(s) + 2NaCl(aq)
Now Ionically;
2OH^-(aq) + Mg^2+(aq) -----> Mg(OH)2(s)
Concentration of OH^- = Antilog (-2.58) = 2.6 * 10^-3 M
Number of moles of OH^- = 2.6 * 10^-3 M * 75/1000 = 0.000195 moles
Concentration of Mg^2+ = 0.0018 M
Number of moles of Mg^2+ =0.0018 M * 125/1000 = 0.000225 moles
Since;
1 mole of Mg^2+ reacts with 2 moles of OH^-
x moles of Mg^2+ reacts with 0.000195 moles of OH^-
x = 0.0000975 moles
Mg^2+ is the limiting reactant.
1 mole of Mg^2+ yields 1 mole of the precipitate
0.000225 moles of Mg^2+ yields 0.000225 moles of precipitate.
Hence, a precipitate is formed.
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If a bottle of nail polish remover contains 174 mL of acetone, how much heat would be released by its complete combustion? The density of acetone is 0.788 g/mL .
Answer:
liberates 1790 kJ of heat.
Explanation:
how do x rays use electromagnetic waves?
Answer:
X-rays are a form of electromagnetic radiation, similar to visible light. Unlike light, however, x-rays have higher energy and can pass through most objects, including the body. Medical x-rays are used to generate images of tissues and structures inside the body.
Explanation:
Which fossil fuel is a solid?
O oil
coal
O natural gas
Answer:
Coal
Explanation:
N2+3H2 → 2NH3
A) How many grams of NH3 can be produced from the reaction of 28g of N2 and 25g of H2?
I need the steps to the answer 34g
B) How much of the excess reagent is left over?
I need steps to the answer 19 g
Explanation:
N2 (g) + H2 (g) gives out NH3 (g)
Now balance it. You have two reactants with compositions involving a single element, which makes it very easy to keep track of how much is on each side. I would balance the nitrogens, and then the hydrogens.
Now balance it. You have two reactants with compositions involving a single element, which makes it very easy to keep track of how much is on each side. I would balance the nitrogens, and then the hydrogens.(If you balance the hydrogen reactant with a whole number first, I can guarantee you that you will have to give NH3 a new stoichiometric coefficient.)
N2 (g) + 3H2 (g) gives out 2NH3 (g)
The stoichiometric coefficients tell you that if we can somehow treat every component in the reaction as the same (like on a per-mol basis, hinthint), then one "[molar] equivalent" of nitrogen yields two [molar] equivalents of ammonia.
Luckily, one mol of anything is equal in quantity to one mol of anything else because the comparison is made in the units of mols.
So what do we do? Convert to
mols (remember the hint?).
28g N2 × 1 mol N2/ 2 × 14.007) g N2
= 0.9995 mol N2
At this point you don't even need to calculate the number of mols of H2 . Why? Because H2 is about 2 g/mol, which means we have over 10 mols of H2. We have 1 mol N2, and we need three times as many mols of H2 as we have
N2.
After doing the actual calculation you should realize that we have about 4 times as much H2 as we need. Therefore the limiting reagent is clearly N2.
Thus, we should yield 2×0.9995=1.9990 mols of NH3 (refer back to the reaction). So this is the second and last calculation we need to do:
1.9990 mol NH3 × 17.0307 g NH3/ 1 mol NH3
= 34.0444 g NH3
Hope it helpz~
34grams of NH₃ can be produced from the reaction of 28g of N₂ and 25g of H₂ and 19g of the excess reagent is left over.
What is Mole?The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
Mass of N₂ = 28g
Mass of H₂ = 25g
Moles of N₂ = mass / molar mass
= 28 / 28
= 1 mole
Moles of H₂ = 25 / 2
= 12.5 moles
Since the number of moles of N₂ is lesser, the amount of products formed depends on the moles of N₂.
From the reaction,
1 mole of N₂ gives 2 moles of NH₃
So, Mass of NH₃ in 2 moles = 2 × 17
= 34g
B) From the reaction,
1 mole of N₂ reacts with 3 moles of H₂.
The number of Moles of H₂ left = 12.5 - 3
= 9.5 moles
Mass of excess reagent left = moles left × molar mass of H₂
= 9.5 × 2
= 19g
Therefore, 34grams of NH₃ can be produced from the reaction of 28g of N₂ and 25g of H₂ and 19g of the excess reagent is left over.
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The table compares some characteristics of two atoms.
Charged Particles
Atom Number of Neutrons Mass Number
х
6
12
Y
7
13
Use the table to determine the number of protons for each atom. Then, choose the statement below that is true about the two atoms.
The number of protons in X would be 6 while that of Y would also be 6. Thus, the two atoms would be isotopes of the same element.
Atomic properties of atomsThe mass number of an atom is the sum of protons and neutrons present in the atom.
For X with mass number 12 and neutron number 6, the number of protons would be:
12 - 6 = 6 protons
For Y with mass number 13 and neutron number 7, the number of protons would be:
13 - 7 = 6 protons.
Thus, both atoms have the same number of protons, meaning that they are likely isotopes of the same element.
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what type of critial thinking is important in agriscience
Answer:
Explanation:
Observation. Observational skills are the starting point for critical thinking. People who are observant can quickly sense and identify a new problem.
Analysis. Once a problem has been identified, analysis skills become essential. ...
what is kept constant is constant boyles law
Answer:
temperature, or true. I don't know which you want.
Explanation:
hope this helps
Question 2 (1 point)
A group of friends is cooking an exotic stew in a house in South Florida. One of the
steps of the recipe is that they have to cool off the cooking mixture from 81.70 °C to
49.10 °C. The pot is too big to put it in a fridge for cooling down faster, the cooking
mixture weighted 34.6 kg. Fortunately, one of the friends remembered
thermochemistry and suggested that they put the pot in the small pool that is at the
house to cool it off faster. The pool was not heated and its temperature before
putting the pot with the stew was 19.24 °C. Given that the mass of water in the pool
was 4,825.6 kg, and the specific heat capacity of the pool is 4.30 J/(g°C) and that of
the cooking mixture is 4.20 J/(g°C), what is the final temperature of the pool after
the cooking mixture cooled down to the temperature needed by the recipe?
Your Answer:
Answer
units
Knowing that the system will attin a state of thermal equilibrium, the final temperature of the system is 19.24°C.
What is Thermochemistry?The term thermochemistry has to do with the heat evolved or absorbed in a chemical reaction.
Now we know that the heat gained by the pool is equal to the heat lost by the stew. Hence;
34.6 * 4.20 * ( 81.70 - T) = 4,825.6 * 4.30 * (T - 19.24)
11873 - 145.3T = 2075008T - 39923153.92
11873 + 39923153.9 = 2075008T + 145.3T
39935026.92 = 2075153.3T
T = 39935026.92/2075153.3
T = 19.24°C
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The first ionization energy of mercury is 1006 kJ/mol. The energy change for the reaction Hg(l) →Hg+(g) + e– is therefore
For the first ionization energy of mercury is 1006 kJ/mol. The energy change for the reaction is mathematically given as
dH = 1006KJ/mol
What is the energy change for the reaction?The amount of energy required to remove an electron from a neutral atom is called ionization energy. from the question, the electron is removed from the neutral atom Hg to give the first ionization energy
Hg→Hg +e
therefore the energy change for the reaction is
dH = 1006KJ/mol
In conclusion, the energy change for the reaction is
dH = 1006KJ/mol
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Calculate the pH of solution
that has
[H+]of 8.1 x10^-4
Answer:
Explanation:
Calculate the pH of solution
that has
[H+]of 8.1 x10^-4
what conditions does bacteria need to grow in yogurt?
the forces that keep liquid particles together are called _____ forces of attraction
Answer:
The forces that keep liquid particles together are called intermolecular forces of attraction.
Which of the following will oxygen react with to cause combustion?
O A. A hydrocarbon
O B. Heat
O C. Carbon dioxide
O D. Water
HELP
Answer:
hydrocarbon
Explanation:
it reacts with oxygen to produce water and carbon dioxide.
hope this helps.
Which is stronger, the C=O bond in an ester (1735 cm–1) or the C=O bond in a saturated ketone (1715 cm–1)? Explain
What is ostwald process?? Give the first catalytic reaction of this process. .
Don't spam
Answer: Smelling salts and oxygen are introduced into a metal catalyst-containing tube (platinum). Typically warmed to get the reaction started. The alkali is then oxidized to produce nitric oxide.
Answer:
The Ostwald process is a chemical process used for making nitric acid. Wilhelm Ostwald developed the process, and he patented it in 1902. The Ostwald process is a mainstay of the modern chemical industry, and it provides the main raw material for the most common type of fertilizer production
Explanation:
The first stage of the Ostwald process involves the catalytic oxidation of ammonia into nitric oxide, using platinum as the catalyst. The nitric oxide is then transferred to a different oxidizing tower, where it is oxidized into nitrogen dioxide
At 25°C the vapour pressure of pure pentane is 511 torr and that of hexane is 150. torr.
What is the mole fraction of pentane in a pentane-hexane solution that has a vapour pressure of 383 torr at 25°C?
ANSWER IS 6.45×10-1
QUESTION: What is the mole fraction of hexane in the vapour that is in equilibrium with this solution?
(Assume ideal gas behaviour.)
Based on the vapor pressure of the pure substances, the mole fraction of pentane is 0.45 and mole fraction of hexane at equilibrium is 0.60.
What is vapor pressure of a liquid?Vapor pressure of of a liquid is the pressure that is excreted on the walls of a sealed vessel by the molecules of the liquid that have been converted to gaseous phase.
TO determine the mole fraction of pentane in the solution, we use the vapor pressure of the pure substances.
Let the mole fraction of pentane in the mixture be X.
The mole fraction of hexane will be 1 - X
The vapor pressure of the solution = (mole fraction of pentane × vapor pressure of pentane) + (mole fraction of hexane × vapor pressure of hexane)Vapor pressure of solution = 383 torr
(mole fraction of pentane × vapor pressure of pentane) + (mole fraction of hexane × vapor pressure of hexane) = 383 torr
X × 511 + (1 - X) × 150 = 383
511X - 150X + 150 = 383
511X = 233
X = 0.45
Also , at equilibrium, the vapor pressure of pentane = 0.45 × 511 = 230 torr
mole fraction of hexane in the vapor that is in equilibrium with this solution = 230/383
mole fraction of hexane at equilibrium = 0.60
Therefore, the mole fraction of pentane is 0.45 and mole fraction of hexane at equilibrium is 0.60.
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Which characteristic do all owl families share? A.) small eyes B.) large body size C.) nighttime hunting D.) heart-shaped faces
Need this answer in 5 MINUTES!
If any turtors are out there I need a Verified answer
Heart-shaped faces is the characteristic all owl families share and it is denoted as option D.
What is an Owl?
This is a type of bird which is known for its heart shaped face, big round eyes and reversible toe.
This animal has majority of its species as night time hunters which is why option D was chosen.
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Determine the mass of the following samples
3 moles of Mg
4.2 moles of NaCI
Answer:
See below
Explanation:
From periodic chart
Mg = 24.305 gm per mole
24.305 * 3 = 72.915 gm
Na = 22.989
Cl = 35.45 summed = 58.439 gm per mole
58.439 * 4.2 = 245.4438 gm
What happens to a positively charged ion during a chemical change?
Answer:
Positively charged ions move to the negative electrode during electrolysis
Explanation:
Electrolysis is the process by which electric current is passed through a substance to effect a chemical change
I hope I was able to help
A 0.563 M solution of the salt NaA has a pH of 11.56. Calculate the Ka value for the acid HA. Record your answer in scientific notation to 3 sig figs.
Answer:
[tex]\displaystyle K_a = 4.24\times 10^{-10}[/tex]
Explanation:
Write the base reaction of NaA with water:
[tex]\displaystyle \text{A}^-_\text{(aq)}+\text{H$_2$O}_\text{($\ell$)}\rightleftharpoons \text{HA}_\text{(aq)} + \text{OH}^-_\text{(aq)}[/tex]
Hence, the equilibrium constant expression for the reaction is:
[tex]\displaystyle K_b = \frac{[\text{OH}^-][\text{HA}]}{[\text{A}^-]}[/tex]
Thus, to find Ka, we can find Kb and use the fact that Ka × Kb = Kw.
From the reaction and initial concentration of NaA, create an ICE chart:
[tex]\begin{tabular}{llllll} & A^- &\text{H$_2$O} & \rightleftharpoons & HA & OH^- \\I & 0.563 M & \---- & & 0 M & 0 M \\C & -\text{ $ x$} & \---- & & +\text{ $x$ M} & + \text{$x$ M} \\E & \text{(0.563 - $x$) M} & \---- & & \text{$x$ M} & \text{$x$ M} \end{tabular}[/tex]
Find [OH⁻] from the given pH:
[tex]\displaystyle \begin{aligned} \text{pH} +\text{pOH} & = 14.00 \\ \\ \text{pOH} & = 14.00 - \text{pH} \\ \\ & = 14.00 - (11.56) \\ \\ & = 2.44 \\ \\ -\log[\text{OH}^-] & = 2.44 \\ \\ [\text{OH}^-] &= 10^{-2.44} \\ \\ & =0.00363 \text{ M}= 3.63\times 10^{-3} \text{ M} = x\text{ M}\end{aligned}[/tex]
Solve for all species concentrations at equilibrium from the found x value:
[tex]\displaystyle [\text{HA}] = [\text{OH}^-] = 3.63\times 10^{-3} \text{ M}[/tex]
And:
[tex]\displaystyle \begin{aligned} \ [\text{A}^-] & = 0.563 - 3.63\times 10^{-3} \text{ M}\\ \\ & = 0.559\text{ M}\end{aligned}[/tex]
Find Kb:
[tex]\displaystyle \begin{aligned} \displaystyle K_b &= \frac{[\text{OH}^-][\text{HA}]}{[\text{A}^-]} \\ \\ & = \frac{(3.63\times 10^{-3})(3.63\times 10^{-3})}{(0.559)}\\ \\ & = 2.36\times 10^{-5}\end{aligned}[/tex]
Find Ka:
[tex]\displaystyle \begin{aligned} K_a\cdot K_b & = K_w \\ \\ K_a & = \frac{K_w}{K_b} \\ \\ & = \frac{(1.00 \times 10^{-14})}{(2.36\times 10^{-5})} \\ \\ &= 4.24\times 10^{-10} \end{aligned}[/tex]
In conclusion:
[tex]\displaystyle K_a = 4.24\times 10^{-10}[/tex]
A molecule that is either cycloheptane or cycloheptene is treated with bromine and the sample immediately absorbs the red bromine color—which compound is present?
Since the molecule is able to immediately absorb the red color of the bromine, the molecule would be cycloheptene.
What is unsaturation?Unsaturation in organic compounds refers to the presence of double or triple bonds in the compounds.
One way to test for unsaturation is to use bromine water. A saturated compound will not be able to absorb bromine because it is already saturated.
An unsaturated compound, on the other hand, will be able to absorb bromine due to the unsaturation. Therefore, the red color of bromine will disappear due to absorption.
Cycloheptane is saturated while cycloheptene is unsaturated. Thus, the latter will absorb the red color of bromine.
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Which statement best summarizes the way the sun produces energy?
A. Combustion reactions in the sun release large amounts of chemical energy.
B. Fusion reactions in the sun release large amounts of chemical energy.
C. Combustion reactions in the sun convert small amounts of matter into large amounts of energy.
D. Fusion reactions in the sun convert small amounts of matter into large amounts of energy.
Answer: D. Fusion reactions in the sun convert small amounts of mayter into large amounts of energy.
How many grams of acid will be neutralized by a Maalox antacid tablet that contains 0.350 g of CaCO3
The mass of the acid produced is 0.252 g from the information in the question.
What is neutralization?The term neutralization refers to the reaction between an acid and a base that yileds salt and water only.
The equation of this reaction is; 2HCl + CaCO3 ----->CaCl2 + CO2 + H2O
Number of moles of CaCO3 = 0.350 g/100 g = 0.0035 moles
Since 2 moles of acid reacts with 1 mole of CaCO3
x moles acid reacts with 0.0035 moles of CaCO3
x = 0.007 moles
Mass of acid = 0.007 moles * 36 g/mol = 0.252 g
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How many kilograms are present in 6.78x1025molecules of Al2(SO4)3? (hint 1kg=103g)
Atomic masses:
Al = 27
S = 32
O = 16
A) 0.891kg
B) 38.5kg
C) Cannot be determined
D) 8.44kg
mol = 6.78 x 10²⁵ : 6.02 x 10²³ = 112.62
MM Al₂(SO₄)₃ = 2.27 + 3.32+12.16 =342 g/mol
mass = 112.62 x 342 = 38516.04 g = 38.5 kg
The total mass of 6.78*[tex]10^{25}[/tex] molecules of [tex]Al_{2}(SO_{4})^3[/tex] is (b) 38.5 Kg.
To calculate the mass, we need to first understand the values given in the question:1 mole of [tex]Al_{2}(SO_{4})^3[/tex] contains 6.02*[tex]10^{23}[/tex] molecules6.78*[tex]10^{25}[/tex]/6.02*[tex]10^{23}[/tex] moles are in the given amount of [tex]Al_{2}(SO_{4})^3\\[/tex]112.62 moles of [tex]Al_{2}(SO_{4})^3[/tex] is availableWeight of 1 mole [tex]Al_{2}(SO_{4})^3[/tex] is 342 gramsHence, weight of 112.62 moles of [tex]Al_{2}(SO_{4})^3[/tex] = 112.62*342 gramsThe total mass is equal to 38516.04 grams, which is equal to 38.5 Kg.Hence, the total weight of 6.78*[tex]10^{25}[/tex] molecules of [tex]Al_{2}(SO_{4})^3[/tex] is (b) 38.5 Kg.
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PLEASE john travoltage is safe from getting a static electricity zap right now. there are two things that could change to increase his chances from getting zapped tell me what both if those things are
If he rubs his foot on the carpet or touches the metal doorknob it would increase his chances of being zapped.
Rubbing his feet would be friction.
Touching the doorknob would be potential energy.
Side note: I love the format for this question, was not expecting to see John Travolatge on here today >O< !!!
the carbon atom which becomes asymmetric when the straight chain form of monosaccharide change into ring form is known as____\
Answer:
CARBOHYDRATES AND CARBOHYDRATE METABOLISM
Predict the missing component in the nuclear equation
11C -> X + 0e
6 1
Answer:
A. Boron-11 with atomic number 5
Which of the following correctly describes what happens to the kinetic energy of water when it changes from the liquic
state to the solid state?
• There is no change in the kinetic energy of the molecules.
O The kinetic of energy of the molecules increases.
• The kinetic energy of the molecules increases then decreases.
of O The kinetic energy of the molecules decreases.
Answer:
The kinetic energy decreases
Explanation:
When water freezes, it is losing heat. Heat and energy are interchangeable, meaning it loses energy.
Answer:
The kinetic energy of the molecules decreases.
Explanation:
because when temperature decreases the average kinetic energy of the gas molecules decreases as well.
