Question

What mass of water would you need to have 15.0 moles of h2o?

Answer 1

For one mole, 18 grams of h2o is required.
weight of one mole=mol.wt in grams=2(H)+O=2(1)+16=18 g
Weight of 15 mole=18*15=270 grams

Answer 2

The mass of given amount of water is 270 g

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

We are given:

Moles of water = 15.0 moles

Molar mass of water = 18 g/mol

Putting values in above equation, we get:

$15.0mol=\frac{\text{Mass of water}}{18g/mol}\\\\\text{Mass of water}=(15.0mol\times 18g/mol}=270g$

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