How many grams of hydrogen atoms are present in 16.4 g of water?
A)33.1 g
B)0.91 g
C)1.84 g
D)2.20 g
E)10.9 g

Question

Quizplus · Accepted Answer

Water (H2O) has a molar mass of 18 g/mol, with 2 g/mol from hydrogen. In 16.4 g of water, there are 16.4 g / 18 g/mol = 0.911 mol of water. Since each mole of water contains 2 moles of hydrogen, there are 0.911 mol * 2 = 1.822 mol of hydrogen. The mass of hydrogen is 1.822 mol * 1 g/mol = 1.822 g, approximately 1.84 g.

How Many Grams of Hydrogen Atoms Are Present in 16