Answer:
2450 mg
Explanation:
From the given information:
The total weight of the capsule = 12.5 mg + 37.5 mg
= 50 mg
The percentage of drug in each capsule = [tex]\dfrac{12.5}{50} \times 100[/tex]
= 25%
= 0.25
To make 0.5 mg of drug in each 100 mg of powder after dilution;
Then, the drug percent in each capsule after dilution is:
[tex]=\dfrac{0.5}{100}\times 100[/tex]
= 0.5%
= 0.005
Suppose (p) mg represent the amount that is added to the diluent in the given capsule. Then;
The total amount is = (50 + p) mg
Since the amount of the drug = 12.5 mg
Then the concentration [tex]=\dfrac{12.5}{50 + x}[/tex] which needs to be equal to the needed concentration that is diluted.
i.e.
[tex]\dfrac{12.5}{50 + x} = 0.005[/tex]
By cross multiply;
(50 + x) 0.005 = 12.5
(50 × 0.005) + (0.005x) = 12.5
0.25 + 0.005x = 12.5
0.005x = 12.5 - 0.25
0.005x = 12.25
x = 12.25 / 0.005
x = 2450 mg
Thus, there is a need for an additional 2450 mg to make a dilution that compass 0.5 mg of drug in 100 mg powder.
Carbon burns in the presence of oxygen to give carbon dioxide. Which chemical equation describes this reaction?
ОА. .
carbon + oxygen + carbon dioxide
ОВ.
carbon + oxygen carbon dioxide
Ос. .
carbon dioxide carbon + oxygen
OD carbon dioxide + carbon - Oxygen
Answer:
(carbon dioxide → carbon + oxygen. (carbon dioxide + carbon → oxygen.
Explanation:
I'm not really sure if this is the answer
The density of gold is 19.3 g/cm³. Which of the following shows the mass of a gold bar that is 4.50 cm × 8.00 cm × 20.00 cm?
Answer:
13896g
Explanation:
volume = 4.50×8.00×20.00 = 720 cm³
mass = density × volume
mass= 19.3 × 720 = 13896g
what kind of structure do the cations and anions in table salt form
Answer:
ionic solids
Explanation:
Ionic solids are a regular pattern of cations and anions that arrange themselves into a continuous solid network.
NaCl is composed of sodium ions and chloride ions that are held together by Coulumbic attractive forces to form a large crystal structure.
Such ionic solids have a very high melting point and do not conduct electricity in the sold state. However, the molten substance or a solution of the substance conducts electricity.
Convert this measurement, 3.2x10-3 mm, from scientific notation to standard notation
Answer:
0.0032mm
Explanation:
Given dimension:
Measurement = 3.2 x 10⁻³mm
Unknown:
Write in standard notation from scientific notation = ?
Solution:
The standard notation is the way we normally write.
For example; standard notation of 1 million is 1000000
Now;
3.2 x 10⁻³ = [tex]\frac{3.2}{1000}[/tex] = 0.0032mm
3.2x10⁻³ mm in standard notation is 0.0032 mm. The normal or generally accepted manner of representing or expressing anything is referred to as standard notation.
Standard notation refers to the conventional or widely accepted way of representing or expressing something. In mathematics, for example, standard notation refers to the commonly used symbols and formats for writing mathematical expressions, equations, or numbers. The use of standard notation ensures uniformity, ease of understanding, and communication among mathematicians and students. Powers of 10 are used in scientific notation to express extremely large or extremely small quantities. 3.2x10⁻³ mm in standard notation is 0.0032 mm.
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In a synthesis reaction, the elements Fe and S might react to form which of the following?
A
H_2
2
O
B
FeS
C
Na and Cl
D
All of the above
Answer:
A
Explanation:
thanks for the points
Answer: it B
Explanation: i just took the test
Identify the type of reaction: H2CO3 → H20 + CO2
Answer: In the reaction carbonic acid and decomposes form's a water and carbon dioxide gas. Hence this is the an example of a decomposition reaction.
Explanation:
DEFINITION: ABILITY OF A SUBSTANCE TO BE DISSOLVED
Answer:
Solubility
Explanation:
If its not that the answer is Dissolvable.... you didn't give a word bank.
:))))))))))
How many moles are in 265 grams of Na2CO3?
Answer:
The answer is 105.98844.
Explanation:
We assume you are converting between grams Na2CO3 and mole. You can view more details on each measurement unit: molecular weight of Na2CO3 or mol This compound is also known as Sodium Carbonate. The SI base unit for amount of substance is the mole.
Considering the definition of molar mass, 2.5 moles are in 265 grams of Na₂CO₃.
But first you have to know that molar mass is the mass of one mole of a substance, which can be an element or a compound.
In a compound the molar mass is equal to the sum of the weight or atomic mass of its atoms multiplied by their quantity.
In this case, the atomic mass of the elements of the compound are:
Na: 23 g/moleC: 12 g/moleO: 16 g/moleThen the atomic mass of the compound Na₂CO₃ is:
Na₂CO₃= 2× 23 g/mole + 12 g/mole + 3×16 g/mole
Na₂CO₃= 106 g/mole
Then you can apply the following rule of three: if by definition of molar mass 106 grams of the compound are contained in 1 mole, 265 grams are contained in how many moles?
[tex]amount of moles=\frac{265 gramsx1 mole}{106 grams}[/tex]
amount of moles= 2.5 moles
In summary, 2.5 moles are in 265 grams of Na₂CO₃.
Learn more:
https://brainly.com/question/15721168?referrer=searchResultshttps://brainly.com/question/15484208?referrer=searchResultshttps://brainly.com/question/14124542?referrer=searchResultshttps://brainly.com/question/2903329?referrer=searchResultsThe chemical equation below shows the combustion of propane (C3H8).
C3H8 + 5O2 Right arrow. 3CO2 + 4H2O
The molar mass of oxygen gas (O2) is 32.00 g/mol. The molar mass of C3H8 is 44.1 g/mol. What mass of O2, in grams, is required to completely react with 0.025 g C3H8?
0.018
0.034
0.045
0.091
Answer:
0.091
Explanation:
just took test on edg
Answer:
0.091
Explanation:
correct on edge 2021 unit test
were do baby's come from
Answer:
Their moms and dads. ;)
Explanation:
Element X has two naturally occurring isotopes, 65X (isotopic mass 65.0457 amu, abundance 20.53%) and 67X (isotopic mass 66.9704 amu, abundance 79.47%). Calculate the atomic mass of element X.
Answer:
66.5753 amu
Explanation:
From the question given above, the following data were obtained:
Isotope A (⁶⁵X):
Mass of A = 65.0457 amu
Abundance of A = 20.53%
Isotope B (⁶⁷X):
Mass of B = 66.9704 amu
Abundance of B = 79.47%
Atomic mass of X =?
The atomic mass of X can be obtained as follow:
Atomic mass = [(mass of A × A%)/100] + [(mass of B × B%)/100]
= [(65.0457 × 20.53)/100] + [(66.9704 × 79.47)/100]
= 13.3539 + 53.2214
= 66.5753 amu
Therefore, the atomic mass of X is 66.5753 amu.
Element X, with an atomic mass of 66.58 amu, has 2 naturally occurring isotopes, ⁶⁵X (65.0457 amu, 20.53%) and ⁶⁷X (66.9704 amu, 79.47%).
What is the average atomic mass?The average atomic mass (atomic mass) of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance.
Element X has 2 isotopes:
⁶⁵X with an isotopic mass of 65.0457 amu and an abundance of 20.53% (0.2053).⁶⁷X with an isotopic mass of 66.9704 amu and an abundance of 79.47% (0.7947).We can calculate the average atomic mass of X using the following expression.
mX = m⁶⁵X × ab⁶⁵X + m⁶⁷X × ab⁶⁷X
mX = 65.0457 amu × 0.2053 + 66.9704 amu × 0.7947
mX = 66.58 amu
Element X, with an atomic mass of 66.58 amu, has 2 naturally occurring isotopes, ⁶⁵X (65.0457 amu, 20.53%) and ⁶⁷X (66.9704 amu, 79.47%).
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A student investigated how much solid was dissolved in sea water.
The student:
1. Measured the mass of an empty evaporating basin.
2. Measured 50 cm3 of sea water and poured it into the evaporating basin.
3. Heated the evaporating basin gently until all of the water had evaporated.
4. Measured the mass of the evaporating basin containing the solid residue.
5. Reheated the evaporating basin and solid residue.
6. Measured the mass of the evaporating basin and solid residue.
7. Repeated steps 5 and 6 until the mass was constant.
Name two different pieces of apparatus that would be suitable for measuring:
• The mass of the evaporating basin
• 50 cm3 of sea water
Equipment to measure the mass of the evaporating basin_______________________
Equipment to measure 50 cm3 of sea water ________________________________
Answer:
weighing balance/analytical balance
Graduated cylinder/buret
Explanation:
The mass of the evaporating basin could be measured using a weighing balance or an analytical balance. Both are classified as weighing scales but the analytical balance can measure the mass of objects up to 4 decimal places, thus, providing better accuracy in measurement than ordinary weighing balance that can only measure up to 2 decimal places.
In order to measure 50 cm3 of the sea water, a graduated cylinder or a buret can be used. Both equipment can measure up to the same decimal places and, thus, have virtually the same accuracy.
What did Aristotle believe?
A. That matter did not exist in the physical world
B. That the scientific method should be used to test ideas
C. That all matter was composed of earth, fire, water, and air
D. That all matter was composed of tiny atoms
Answer:
C.) That all matter was composed of earth, fire, water and air
Explanation:
Just took the test
Methanol, or wood alcohol, is the combustible material used in sterno. Write a balanced equation for the complete oxidation reaction that occurs when methanol (CH3OH) burns in air. Use the smallest possible integer coefficients.
Answer:
2CH₃OH + 3O₂ → 2CO₂ + 4H₂O
Explanation:
A complete reaction for when any organic compound burns in air, produces only water and carbon dioxide. It does so by reacting with the oxygen gas (O₂) present in air.
In the case of methanol (CH₃OH) combustion, the balanced reaction is:
2CH₃OH + 3O₂ → 2CO₂ + 4H₂O
Object A has a density of 2.0 and a mass of 100 g. Object B a density of 0.8 and a mass of 240 g. Object Ca
density of 5.0
and a mass of 100 g. Which of the objects above (A, B, or C) has the least volume?
cm
To determine which object has the least volume, we can calculate the volume of each object using the formula of density. From this, Object C has the smallest volume of 20 cm³ among Objects A, B, and C.
The formulae of volume:
Volume = Mass / Density
Let's calculate the volumes of objects A, B, and C:
For Object A:
Density = 2.0 g/cm³
Mass = 100 g
Volume of A = Mass / Density
Volume of A = 100 g / 2.0 g/cm³
Volume of A = 50 cm³
For Object B:
Density = 0.8 g/cm³
Mass = 240 g
Volume of B = Mass / Density
Volume of B = 240 g / 0.8 g/cm³
Volume of B = 300 cm³
For Object C:
Density = 5.0 g/cm³
Mass = 100 g
Volume of C = Mass / Density
Volume of C = 100 g / 5.0 g/cm³
Volume of C= 20 cm³
Comparing the volumes, we find that Object C has the least volume, with 20 cm³.
Therefore, Object C has the smallest volume among Objects A, B, and C.
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structural formula of 1 methyl butane
Answer:
CH(CH3)2C2H5 or C5H12
Explanation:
Methyl butane or isopentane is an hydrocarbon or an alkane hydrocarbon with the formula C5H12. It has five carbons and twelve hydrogens. It is volatile and highly flammable. It has high boiling point and it can boil away at room temperature on a noon day. It is use as refrigerants. It can easily vanishes to the atmosphere when exposed
How have government and businesses impacted energy efficiency?
Answer:
Government programs aim to increase incentives for consumers and producers to move toward energy efficiency.
Explanation:
Government programs aim to increase incentives for consumers and producers to move toward energy efficiency.
A solution is prepare using 45.2 g of an unknown (nonelectrolyte) dissolved in 476.4 g of water. The freezing point depression
of the solution compared to water is measured to be 1.87°C. What is the molar mass of the unknown (in g/mol)?
Some possibly useful constants for water are K= 1.86°C/m and Kb = 0.512°C/m.
Enter your value using three significant figures.
Answer:
94.4g/mol is molar mass of the unknown
Explanation:
Based on the freezing point depression equation:
ΔT = Kf*m*i
Where ΔT is the depression in freezing point (1.87°C)
Kf is freezing point depression constant of water (1.86°Ckg/mol)
And i is Van't Hoff factor (1 for nonelectrolyte solutes)
Replacing:
1.87°C = 1.86°CKg/mol*m*i
1.005mol/kg solvent = m
Using the mass of the solvent we can find the oles of the nonelectrolyte:
1.005mol/kg solvent * 0.4764kg = 0.479moles
Molar mass is defined as the ratio between mass of a substance in grams and moles, that is:
45.2g / 0.479mol =
94.4g/mol is molar mass of the unknowncan u pls help me with this question
Answer:
Explanation:
Answer:
A
Explanation:
Can you please help me it’s due at 3:00 please hurry whoever answers this correct I will mark brainliest
A 25.00 mL sample of H 2SO 4 requires 31.43 mL of 0.110 M NaOH to reach the equivalence point. What is the molarity of the H 2SO 4
Answer:
0.069 M
Explanation:
Equation of the reaction:
H₂SO₄(aq) + 2NaOH(aq) ⇒ Na₂SO₄(aq)+2H₂O(l)
From the equation above, 2 mole of NaOH is required to reach equivalent point with 1 mole of H₂SO₄.
n'CV = nC'V' ........................ Equation 1
Where n and n' = are number of moles of acid and base respectively, C and C' = are molarities of acid and base respectively, V and V' are volumes of acid and base respectively.
make C the subject of the equation
C = nC'V'/n'V.............................. Equation 2
Given: n = 1, n' = 2, C' = 0.11 M, V = 25 mL, V' = 31.43 mL
Substitute into equation 2
C = (1×0.11×31.43)/(25×2)
C = 0.069 M.
Hence the molarity of H₂SO₄ is 0.069 M
When temperature increases, the random movement of molecules increases which subsequently increases diffusion rate. If you have the same concentration of each of the following substances and they all have the same molecular weight, predict which substance will have the greatest diffusion rate?
a. substance #3 in aliquid at 64' F
b. substance 14 in a gas at 32 F
c. substance #2 in aliquid at a 32°F
d. substance #5 in a gas at 78' F
e. substance in a semisolid at 78' F
Answer:
d. substance #5 in a gas at 78' F
Explanation:
Diffusion in substances simply has to do with the movement of the particles of a substance from one point to another.
The rate of diffusion varies in gases, liquids and solids. Gas molecules are usually more energetic than molecules of solids and liquids. Gases and are also in constant random motion at high velocities.
Therefore, substance #5 in a gas at 78' F will have the greatest diffusion rate.
4. Which of the following elements should be the best conductor of electric current?
Aluminum
Nitrogen
Helium
Phosphorus
Answer:
Aluminium
Explanation:
Answer:
aluminum because all the other three are not metals or conductors
Explanation:
Which food does an animal with wide, flat teeth most likely eat?
O A fish
O B. meat
O c. plants
OD. Insects
Answer:
plants
Explanation:
2LiClO+KHSO - Li2SO4 + Cl2 + KOOH
1. How many moles of KOOH is produced, if you started the reaction with 5 moles of
LiCIO?
Answer:
2.5 moles of KOOH are produced.
Explanation:
1)Given data:
Number of moles of KOOH produced = ?
Number of moles of LiClO = 5 mol
Solution:
Chemical equation:
2LiClO + KHSO₄ → Li₂SO₄ + Cl₂ + KOOH
now we will compare the moles of KOOH and LiClO.
LiClO : KOOH
2 : 1
5 : 1/2×5 = 2.5
2.5 moles of KOOH are produced.
Please help me thanks so much?!?!?.:;)))) I will mark you:))
Answer:
D)
Explanation:
Answer:
the last one
Explanation:
Hydrogen has 2 naturally occurring isotopes hydrogen -1 and hydrogen-2. what is the symbol for each of these isotopes?
Answer:
Their nuclear symbols are therefore 1H, 2H, and 3H.
Explanation:
define blood circulation brefly
Answer:
blood circulation The circulation of blood refers to its continual flow from the heart, through branching arteries, to reach and traverse the microscopic vessels in all parts of the body, reconverging in the veins and returning to the heart, to flow thence through the lungs and back to the heart to start the circuit.
That is the answer. Your welcome
how does mixture relate to life
Answer:
For example, when we bake a cake, it's a result of a mixture of eggs, flour, sugar, and other ingredients. Any time two or more items are combined, a mixture is formed. Sometimes, the different parts of a mixture can be separated into individual entities. Other times, they're married for as long as they exist.
Explanation:
At a given set of conditions 241.8 kJ of heat is released when one mole of H2O forms from its elements. Under the same conditions 285.8 KJ is released when one mole of H2O is formed from its elements. Find Delta h of the vaporization of water at these conditions
Answer:
44Kj
Explanation:
These are the equations for the reaction described in the question,
Vaporization which can be defined as transition of substance from liquid phase to vapor
H2(g)+ 1/2 O2(g) ------>H2O(g). Δ H
-241.8kj -------eqn(1)
H2(g)+ 1/2 O2(g) ------>H2O(l).
Δ H =285.8kj ---------eqn(2)
But from the second equation we can see that it moves from gas to liquid, we we rewrite the equation for vaporization of water as
H2O(l) ------>>H2O(g)---------------eqn(3)
But the equation from eqn(2) the eqn does go with vaporization so we can re- write as
H2O ------> H2(g)+ 1/2 O2(g)
Δ H= 285.8kj ---------------eqn(4)
To find Delta h of the vaporization of water at these conditions, we sum up eqn(1) and eqn(4)
Δ H=285.8kj +(-241.8kj)= 44kj
