Question

Water is 11% hydrogen and 89% oxygen by mass. How many grams of oxygen are in a 250 g glass of water?

Answer 1

222.5 g

I did it like this:

X/250= 89/100=
22250/100=
222.5

Answer 2

222.5g of oxygen

Step-by-step explanation:

Percentage composition of water in 18g (molar mass) is

Hydrogen = 11%

Oxygen = 89%

Molar mass of water (H₂O) = [(1*2) + (16*1)] = 18g/mol

In 18g H₂O 11% of hydrogen is

11 / 100 = x / 18

x = (11*18) /100

x = 1.98g

1.98g of hydrogen is present in 18g of H₂O

89% of oxygen in 18g of H₂O

(89 / 100) = y / 18

y = (89*18) / 100

y = 16.02g

16.02g of O is present in 18g of H₂O

y g of O will be present in 250g of H₂O

y = (250*16.02) / 18

y = 222.5g of oxygen

222.5g of oxygen is present in 250g of water