If 26.0 g of water, H₂O , is found to contain 2.9 g of hydrogen and 23.1 g of oxygen, how much hydrogen and oxygen, in grams, is contained in 32.0 g of water? A) 3.6 g hydrogen and 28.4 g oxygen B) 28.4 g hydrogen and 3.6 g oxygen C) 26.0 g hydrogen and 28.4 g oxygen D) 3.6 g hydrogen and 2.9 g oxygen E) 2.9 g hydrogen and 28.4 g oxygen

Question

Quizplus · Accepted Answer

We can use the given information to find the mass percent composition of hydrogen and oxygen in water.

Mass percent of hydrogen = (mass of hydrogen / total mass of water) x 100%
                       = (2.9 g / 26.0 g) x 100%
                       = 11.15%

Mass percent of oxygen = (mass of oxygen / total mass of water) x 100%
                      = (23.1 g / 26.0 g) x 100%
                      = 88.85%

Since the mass percent composition of hydrogen and oxygen in water are constant, we can use them to find the amount of hydrogen and oxygen in 32.0 g of water.

Mass of hydrogen in 32.0 g of water = (mass percent of hydrogen / 100%) x total mass of water
                                      = (11.15% / 100%) x 32.0 g
                                      = 3.6 g

Mass of oxygen in 32.0 g of water = (mass percent of oxygen / 100%) x total mass of water
                                   = (88.85% / 100%) x 32.0 g
                                   = 28.4 g

Therefore, the amount of hydrogen and oxygen in 32.0 g of water is 3.6 g and 28.4 g respectively, which corresponds to choice A.

If 260 G of Water, H2O , Is Found to Contain

If 260 G of Water, H₂O , Is Found to Contain