Answer:
About 67 grams or 67.39 grams
Explanation:
First you would have to remember a few things:
enthalpy to melt ice is called enthalpy of fusion. this value is 6.02kJ/mol
of ice
it takes 4.18 joules to raise 1 gram of liquid water 1 degree C
water boils at 100 degrees C and water melts above 0 degrees C
1 kilojoules is 1000 joules
water's enthalpy of vaporization (steam) is 40.68 kJ/mol
a mole of water is 18.02 grams
we also have to assume the ice is at 0 degrees C
Step 1
Now start with your ice. The enthalpy of fusion for ice is calculated with this formula:
q = n x ΔH q= energy, n = moles of water, ΔH=enthalpy of fusion
Calculate how many moles of ice you have:
150g x (1 mol / 18.02 g) = 8.32 moles
Put that into the equation:
q = 8.32 mol x 6.02 = 50.09 kJ of energy to melt 150g of ice
Step 2
To raise 1 gram of water to the boiling point, it would take 4.18 joules times 100 (degrees C) or 418 joules.
So if it takes 418 joules for just 1 gram of water, it would take 150 times that amount to raise 150g to 100 degrees C. 418 x 150 = 62,700 joules or 62.7 kilojoules.
So far you have already used 50.09 kJ to melt the ice and another 62.7 kJ to bring the water to boiling. That's a total of 112.79 kJ.
Step 3
The final step is to see how much energy is left to vaporize the water.
Subtract the energy you used so far from what you were told you have.
265 kJ - 112.79 kJ = 152.21 kJ
Again q = mol x ΔH (vaporization)
You know you only have 152.21 kJ left so find out how many moles that will vaporize.
152.21 kJ = mol x 40.68 or mol = 152.21 / 40.68 = 3.74 moles
This tells you that you have vaporized 3.74 moles with the energy you have left.
Convert that back to grams.
3.74 mol x ( 18.02 g / 1 mol ) = 67.39 grams
. Why can atomic number be used to determine the identity of an element?
Answer:
Because each atomic number is unique.
Explanation:
Atomic number = No. of protons in an element
Each atomic number in each element is unique and that makes it easier to distinguish it between several elements.
Answer:
Because atomic numbers are unique to the element
hope this helps <3
5. What is a habitat?
a) An area of human development
b) A protected area for endangered species
c) The natural home or environment of an animal, plant, or other organism
d) An area where no species live
It's for science
Answer:
c) The natural home or environment of an animal, plant, or other organism
Explanation:
Please note that in order to post questions in Science, you must post in Science section, but not in History. You are asking a wrong question in the wrong section.
Thank You! Please Mark Brainliest! :)
What is the law of conservation of mass and how does it relate to chemical equations?
What does it mean for a
chemical equation to be balanced?
Answer: Matter cannot be created or destroyed in chemical reactions.
Explanation: This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.
Please help I am stuck on this question
i think the answer is nervus cell because they work togtter to form the brain
Only_________are involved in forming chemical bonds betwen two atoms
a. s orbital electrons
b. p orbital electrons
c. valence electrons
d. innermost electrons
C)
Only valence electrons are involved in forming chemical bonds betwen two atoms.
Hope this helped you- have a good day bro cya)
Which is smaller 1.44 or 1.2544
Answer: 1.2544
Explanation:
if you look at the number 1 and 1 are the go to the next number 4 and 2 aren't so 1.44 is bigger while 1.2544 is smaller.
Answer:
1.2544
Explanation:
Why are microwaves idea for transmitting satellite communication signals?
Answer:
Microwaves are best suited because
they have a higher frequency and small wavelength
Satellite communication and Earth observation from space benefit from microwaves that can pass through haze, light rain, snow, clouds, and smoke. Because they can penetrate the atmosphere, microwaves are used. Small wavelength and high frequency is employed for this.
Microwaves are radio waves with short wavelengths and frequencies in the gigahertz (GHz) range. They can send signals over great distances without any data loss thanks to their high frequency. Without producing signal overlap or interference, they may carry a wide range of frequencies.
Electromagnetic radiations include radio waves and microwaves. In communication, both are utilized. Television and radio programs are transmitted by radio waves, but mobile phones and Wi-Fi use microwaves. Radio waves are one of the several alternatives for satellite communication.
To know more about microwaves, visit;
https://brainly.com/question/16188419
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what family is hydrogen in? explain
Explanation:
Hydrogen is a very special element of the periodic table and doesn't belong to any family. While hydrogen sits in Group I, it is NOT an alkali metal.
1. Imagine doing the same virtual experiment using wood as the bottom material, instead of glass or water. Predict how the light would interact with the wood.
The wood can't do the same function as done by the water and glass in the same virtual experiment due to its different chemical composition.
The light will not pass through the wood due to its translucent behaviour that prevents light to pass through it as compared to water and glass which are transparent materials and light can easily pass through it.
So using wood as a bottom material instead of glass and water will not perform the same function as perform by water and glass in the same virtual experiment so we can conclude that wood can't perform the same function in the experiment.
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Ill give brainliest if you answer right
Answer:
I DID NOT SEE U QUESTION PROPELY BRO /SIS
Tổng số hạt e, p, n của nguyên tử M là 40, số hạt mang điện hơn số hạt không mang điện
là 12. Tổng số hạt e, p, n của ng.tử X là 24, số hạt mang điện hơn số hạt không mang điện là 8.
a, Tìm số hiệu, số khối của các nguyên tử M và X.
b, M sẽ mất hay thu thêm bao nhiêu electron, X sẽ mất hay thu thêm bao nhiêu electron để
đạt cấu hình bền vững ?
Answer:
huh I can't understand
Explanation:
what are your language bro
Land can also be called:
A) Money and/or profit
B) Natural Resources
C) Human Resources
Define what the goldilocks zone in our solar system ?
Answer:
the "goldilocks zone" is the habitable zone around a star where it's not too hot and not too cold, so liquid water and life can exist on the planets in this zone.
Explanation:
The distance Earth orbits the Sun is just right for water to remain a liquid and for life to not be frozen or fried. This distance from the Sun is called the habitable zone, or the Goldilocks zone.
14. A gas in a 400 ml flask exerts pressure of 81.0 kPa at 25.0°C. If the gas
was in a 250 ml container at a pressure of 101 kPa, the temperature would be
a) - 124 °C
b) - 41.2°C
c) 20.0°C
d) 232 °C
Answer: B would be the correct answer
Explanation: You will need to use P1V1/T1=P2V2/T2
So
P1= 81.0kPa /101 =0.799atm
V1=0.4L
T1=25.0C +273.15K= 298.15K
P2= 101kPa /101 = 1atm
V2=0.25L
T2= ?
T2=P2V2T1/P1V1
(1.0atm)(0.25L)(298.15K)/(0.799atm)(0.4L) =233.22K-273.15=-39.92C
During the work-up step, aqueous hydrochloric acid is added to the reaction and a gas is observed. what is the composition of the gas?
The gas likely composed of Hydrogen
Hydrogen is one of the most abundant elements that exist in the world and its natural state is a gaseous state. This means hydrogen can be in other states such as liquid or solid if bonded with other elements but it is not its natural state.
For example:
Ice is solid and it contains both hydrogen and oxygen
Hydrochloric acid is usually liquid and it contains Chlorine and Hydrogen
Because of this, during reactions Hydrogen has a tendency to break its bonds with other elements and return to its gaseous state. Based on this, it is likely the gas in this reaction is hydrogen.
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pls help noww
Just want to see who's the smartest here
promise to tag u as brainliest
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
1. The equation representing the equation is ~
[tex] \mathrm{Na + Cl\rightarrow NaCl}[/tex]
The given reaction is a redox reaction because there's a transfer of electron from Sodium (Na) to chlorine (Cl)
where sodium is oxidized (due to loss of electron) and chlorine get reduced (due to gain of electron).
2. Sodium is a highly reactive element which belongs to the 1st group of periodic table, hence it can catch fire if it is kept free in atmosphere. so in order to prevent that it is stored in kerosene oil, which doesn't let Sodium come in contact with air .
Can liquid methane change phases?
Answer: Methane is a gas at standard conditions.
Explanation: However, at low temperature and/or high pressures the gas becomes a liquid or a solid.
Answer: yes
Explanation:
Activity 32 can someone explain how u do this?.
Answer:
write a question and answer it with the words
Explanation:
Gloria/ the bank/ the car
A: where is Gloria going? To the bank, right?
B: Yes, she's going to the bank. She's going in a car.
Which option correctly describes the pattern of reactivity and electronegativity in nonmetals?(1 point)
Both reactivity and electronegativity decrease down a group.
Reactivity decreases down a group, and electronegativity increases down a group.
Both reactivity and electronegativity decrease up a group.
Reactivity increases down a group, and electronegativity decreases down a group.
Answer:A, Both reactivity and electronegativity decrease down a group.
Explanation: As you go down the periodic table they both will decrease
a scientist uses 52g of Na2SO4 for a chemical reaction. how many moles of Na atom does the compound contain a) 0.366 b) 0.732 c) 8.422 d)16.845
Answer:
b). 0.732
Explanation:
52g Na₂SO₄ x 1 mol Na₂SO₄ x 2 mol Na
------------------------- -------------------- = 0.732 mol Na
142.04 g Na₂SO₄ 1 mol Na₂SO₄
Atomic Mass Units
Na₂ = 22.99 x 2 = 45.98
S = 32.06
O₄ = 16 x 4 = 64
Na₂SO₄ = 45.98 + 32.06 + 64 = 142.04
There are 2 moles of Na in 1 mole of Na₂SO₄
What is the process called when oxygen is mixed with another compound or element?
Answer:
Combustion
Explanation:
The process of adding oxygen to anything is called combustion
What is the least apporaiate hypothesis for Eric to make?
Answer:
Where's the questions?
What is the energy of a single photon with a wavelength of 750 nm.
Answer:
Refer to the attachment
only_________are involved in forming chemical bonds betwen two atoms
a. s orbital electrons
b. p orbital electrons
c. valence electrons
d. innermost electrons
Answer:
c. valence electrons
Explanation:
plz help fast lot of points.
Answer:
The one at the top: cuticle
The highest line on the right side: palisade layer
The third line on the left: chloroplast
The line near phloem: vein
The line at the bottom: stomata
Entirely on the attachment.
Explanation:
No need.
which of the following statement is correct for a group of a periodic table.
i} All elements have different valency.
ii} The atomic size decrease as we move down.
iii} The electropositivity increase down the group.
iv} The electronegativity increase down the group.
Answer:
I believe it is B
Explanation:
I am on this lesson too :)
Answer:
III Electropositivity increases down the group
Explanation:
Each school day, it takes Mrs. Wohlfert an hour to drive 50.3 miles to drop Dezzie off at daycare. While she travels on US 20, she looks at her speedometer and it says she's going 75 mph, so she better slow down! Once she arrives in Plymouth, she takes 5 minutes to get Dezzie into daycare and say goodbye. It takes Mrs. Wohlfert 10 minutes to drive the 3.9 miles between daycare and Lincoln. Mrs. Wohlfert stays at school for the day for 8 hours, then leaves Lincoln to pick up Dezzie at daycare and head home.
What is Mrs. Wohlfert's total distance traveled in a day?
What is Mrs. Wohlfert's total time travelling from when she leaves her house in the morning to when she gets back home in the afternoon?
What was Mrs. Wohlfert's instantaneous speed that she saw during her trip to school?
Answer:
7.06
Explanation:
because its improper
A cube measuring 1cm x 1cm x 1cm is full of water, What is the mass of the water in the cube? (Water has a density of 1.0)
d= m/v
1.0=m/1cm^3
1.0×1cm^3=m
m=1kg/cm^3
Someone pls help me I will make you brain
Answer:
I would go with the first option. It shows how people having been releasing more and more carbon dioxide into the atmosphere.
Explanation:
If 84.5 mol of an ideal gas occupies 21.5 L at 305 K, what is the pressure of the gas? pressure: atm
Answer:
98.367 atm
Explanation:
For this, you must use the equation PV=nRT. Since you are looking for P, rearrange the equation so that P= nRT/V.
Now collect the information you have:
n (mol) = 84.5
R (ideal gas constant to find atm not every case) = .08206
T (temperature) = 305 K (always convert to kelvin)
V (volume in liters) = 21.5
Now Use P= (85.5 mol)×(.08206)×(305 K)/(21.5) to get your answer in atm
