After she explains commensalism to her friend, Hailey tries to think of an example of it. Which of the following is an example o
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<u>Answer:</u> The molecular formula for the compound is
<u>Explanation:</u>
We are given:
Percentage of C = 92.26 %
Percentage of H = 7.74 %
Let the mass of compound be 100 g. So, percentages given are taken as mass.
Mass of C = 92.26 g
Mass of H = 7.74 g
To formulate the empirical formula, we need to follow some steps:
- <u>Step 1:</u> Converting the given masses into moles.
Moles of Carbon =
Moles of Hydrogen =
- <u>Step 2:</u> Calculating the mole ratio of the given elements.
For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 7.68 moles.
For Carbon =
For Hydrogen =
- <u>Step 3:</u> Taking the mole ratio as their subscripts.
The ratio of C : H = 1 : 1
The empirical formula for the given compound is
- <u>Calculating the molar mass of the compound:</u>
To calculate the molecular mass, we use the equation given by ideal gas equation:
PV = nRT
Or,
where,
P = pressure of the gas = 820 torr
V = Volume of gas = 250 mL = 0.250 L (Conversion factor: 1 L = 1000 mL )
m = mass of gas = 0.6883 g
M = Molar mass of gas = ?
R = Gas constant =
T = temperature of the gas =
Putting values in above equation, we get:
For determining the molecular formula, we need to determine the valency which is multiplied by each element to get the molecular formula.
The equation used to calculate the valency is:
We are given:
Mass of molecular formula = 78.10 g/mol
Mass of empirical formula = 13 g/mol
Putting values in above equation, we get:
Multiplying this valency by the subscript of every element of empirical formula, we get:
Hence, the molecular formula for the compound is