Question

Examination reveals that 180.2 g/mol of glucose contains 72.1 grams of carbon, 96 g/mol of oxygen and the remainder is hydrogen. How many g of hydrogen are there in 55.5 g of glucose?

Answer 1

Mass of Hydrogen = 3.7 g

Further explanation  

The empirical formula is the smallest comparison of atoms of compound forming elements.  

A molecular formula is a formula that shows the number of atomic elements that make up a compound.  

(empirical formula) n = molecular formula  

180.2 g/mol of glucose-C₆H₁₂O₆ contains 72.1 grams of carbon, 96 g/mol of oxygen and the remainder is hydrogen

Remainder Hydrogen :

$\tt 180-(72.1+96)=11.9~g/mol$

% mass of Hidrogen in Gllucose :

$\tt \dfrac{11.9}{180}\times 100\%=6.61\%$

So mass of Hydrogen in 55.5 g Glucose :

$\tt 6.61\%\times 55.5~g=3.7~g$