Question

How many moles are there in 814.504 g of H2O?

Answer 1

To find the number of moles in 814.504 g of H2O, divide the mass by the molar mass of water (18.015 g/mol), resulting in approximately 45.214 moles of H2O.

Step-by-step explanation:

To calculate how many moles are in 814.504 g of H2O, we use the molar mass of water. The molar mass of H2O is calculated by summing the atomic masses of two hydrogen atoms and one oxygen atom: 2x1.008 g/mol for hydrogen plus 15.999 g/mol for oxygen, which equals approximately 18.015 g/mol. Therefore, the moles of H2O can be determined using the formula:

moles H2O = mass of H2O (in g) / molar mass of H2O (in g/mol).

So, for 814.504 g of H2O:

moles H2O = 814.504 g / 18.015 g/mol ≈ 45.214 moles of H2O.

Answer 2

First you need to calculate the molar mass of H2O. To do that, look at the periodic table and add up the AMUs (atomic mass units)

H = 1.01
O = 16.0

1.01 • 2 + 16.0 = 18.02

Next, use stoichiometry to convert grams into moles. To do that, divide 814.504g by the number of grams in one mole of H2O.

814.504 ÷ 18.02 = 45.2 moles

There are 45.2 moles in 814.504 grams of H2O.