Question

How many grams of H2O are present in 0.25 Mol of it?

Answer 1

Answer:

4.5 grams

Explanation:

The total mass of 1 mole of water molecule is 18g.So to find the mass of 0.25 moles requires just a multiplication 18 with 0.25.

Answer 2

0.25 moles of $H_2O$ is composed of 4.5 g of $H_2O$.

Given:

Moles of $H_2O$(n) = 0.25

To find:

Mass of 0.25 moles of $H_2O$ = ?

Formula to be used:

Number of moles (n) = $\frac{Mass}{Molar mass}$

Calculation:

The molar mass of $H_2O$

= 2(Atomic mass of H) + 1 (Atomic mass of Oxygen)

= 2(1)+1(16)

= 2+16

= 18

∴Molar mass of $H_2O$ = 18g/mol

As the molar mass and number of moles are found, weight can be calculated using the formula

Number of moles = $\frac{Mass}{Molar mass}$

Number of moles × Molar mass = Mass

0.25 × 18 = Mass

4.5 = Mass

Conclusion:

4.5 g of $H_2O$ are present in 0.25 mole of it.

Learn more about such concept

Obtain the moles of substances in the following.

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Question 8 Convert into mole. (a) 12 g of oxygen gas (b) 20 g of water (c) 22 g of carbon dioxide

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