Question

What mass of oxygen would form from 2.30 moles of water?

Answer 1

Answer : The mass of oxygen will be, 36.8 grams

Solution : Given,

Moles of water = 2.30 moles

Molar mass of
`O_2` = 32 g/mole

First we have to calculate the moles of oxygen.

The balanced chemical reaction will be,

`2H_2O\rightarrow 2H_2+O_2`

From the balanced reaction we conclude that

2 moles of water decomposes to give 1 mole of
`O_2`

2.30 moles of water decomposes to give
`(2.3)/(2)=1.15` moles of
`O_2`

Now we have to calculate the mass of oxygen.

`\text{Mass of }O_2=\text{Moles of }O_2* \text{Molar mass of }O_2`

`\text{Mass of }O_2=(1.15moles)* (32g/mole)=36.8g`

Therefore, the mass of oxygen will be, 36.8 grams