Water Ram

How many grams of oxygen are there in 28 g of water?

How many grams of oxygen are there in 28 g of water?

How many grams of hydrogen are there in 23 g of methane gas? The chemical formula for methane is CH4.

1.

Percentage of oxygen by mass in water
= RAM of oxygen / Molar mass of water x 100%
= 16 / 18.02 x 100%
= 88.79%

Mass of oxygen in 28 g of water
= 88.79 / 100 x 28
= 24.86 g

2.

Percentage of hydrogen by mass in methane
= (RAM of hydrogen x 4) / Molar mass of methane x 100%
= (1.01 x 4) / 16.05 x 100%
= 25.17%

Mass of hydrogen in 23 g of methane
= 25.17 / 100 x 23
= 5.79 g

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