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The average mass of one H2O molecule is 18.02 amu. The number of atoms is an exact number, the number of mole is an exact number; they do not affect the number of significant figures. The average mass of one mole of H2O is 18.02 grams. This is stated: the molar mass of water is 18.02 g/mol.

## What is a mole of water?

One mole of water has a mass of 18 grams and volume of 18 milliliters or 0.018 liters. … A mole of water is Avogadro’s number of water molecules. Avogadro’s number is so large that it can be difficult to imagine its size.

## How many moles are in 1 mole of H2O?

A mole (mol) is the amount of a substance that contains 6.02 × 10 ^{23} representative particles of that substance. The mole is the SI unit for amount of a substance. Just like the dozen and the gross, it is a name that stands for a number. There are therefore 6.02 × 10 ^{23} water molecules in a mole of water molecules.

## What is the mass of H2O?

There are 3 moles of O in 50 g.

## What is the mole formula?

If you know the particles, moles, or grams of a substance, you can calculate the other two measurements by using the following equation: 1 mole = 6.022 × 1023 particles/mol = formula weight expressed in grams. … The mass of one mole (6.02 X 1023) of chromium atoms is 51.9961 grams.

## What is the mass of 1 mole of H2O?

The mole, symbol mol, is the SI unit of amount of substance. One mole contains exactly 6.022 140 76 x 10^{23} elementary entities. This number is the fixed numerical value of the Avogadro constant, N_{A}, when expressed in the unit mol^{–}^{1} and is called the Avogadro number.

## What is the mass of 2 mole of water *?

If we have one mole of water, then we know that it will have a mass of 2 grams (for 2 moles of H atoms) + 16 grams (for one mole O atom) = 18 grams.

## How many moles are in 500 mL of water?

Molarity of a solution is the mumber of moles per litre. You have 0.75 moles in 500 ml. Therefore, you have 0.75 moles / 0.5 litre, which is 1.5 moles per liter, or 1.5 Molar.

## How many atoms are in a mole of water?

one mole of water contains 6.02 x 10^{23} MOLECULES of water.

But each molecule of water contains 2 H and 1 O atom = 3 atoms, so there are approximately 1.8 x 10^{24} atoms in a mole of water.

## What is the mass of 5 moles of H2O?

From this you can see that 5 moles of hydrogen gas would react with 2.5 of the available 3 moles of oxygen gas, to form 5 moles of water. The molar mass of water is 18 g/mol, so you would end up with 5 x 18 = 90 g of water.

## What is the number of moles of 36g of H2O?

We know that the molecular mass of water is $18g/mol$. One can calculate the number of moles in a substance using the above formula. Hence, the number of moles in $36g$ of water is two moles.

## How many moles of water are in 100g?

There are approximately 5.55 moles of water in a 100-gram sample of water.