Question

1. Calculate the molar mass of sugar (sucrose: C12H22O1 )

2. What is the percent composition of carbon in sucrose?


3. What is the percent composition of hydrogen in sucrose?


4. What is the percent composition of oxygen in sucrose?

Answer 1

1. 342g/mol

2. 42.1%

3. 6.43%

4. 51.46%

Step-by-step explanation:

Greetings !!!

First let's define the meaning of molecular mass.

Molar mass M is the mass of a chemical compound divided by its amount-of-substance measured in moles. It is defined as MB = m/nB, where m is the total mass of a sample of pure substance and nB is the amount of substance B given in moles. The definition applies to pure substance.

For the first question

solution

The atomic mass of carbon(C)= 12

The atomic mass of Hydrogen(H)= 1

The atomic mass of Oxygen(O)= 16

Molecular mass of sucrose(Table sugar)C₁₂H₂₂O₁₁=

12×(The atomic mass of carbon(C)) + 11×(The atomic mass of Hydrogen(H)) + 11×(The atomic mass of Oxygen(O))

Molecular mass of sucrose = 12×12+22×1+11×16

=144 + 22 + 176

=342g/mol

Secondly, when we look at percent composition first let's define it :-

Percent Composition

1. Find the molar mass of all the elements in the compound in grams per mole.
2. Find the molecular mass of the entire compound.
3. Divide the component's molar mass by the entire molecular mass.
4. You will now have a number between 0 and 1. Multiply it by 100% to get percent composition.

So, let's work on the questions

%Compositions

Carbon= 144/342×100 = 42.1%

Hydrogen = 22/342×100= 6.43%

Oxygen = 176/342×100= 51.46%

And to be more sure add those percent values

Thus, 42.1%+6.43%+51.46%= 99.99%

If you have any questions and unclear ideas tag it on comments

Hope it helps!!