# How many moles of H2O are present in 75.0 g of H2O?

The number of moles of H2O present in 75. 0 g of H2O can be determined by utilizing the formula of moles = mass/molar mass. The molar mass of H2O is 18. 015 g/mol, so the calculation would be 75. 0 g/18.

015 g/mol = 4. 16 moles of H2O present. Therefore, there are 4. 16 moles of H2O present in 75. 0 g of H2O.

## How do you find the moles of H2O?

To find the moles of H2O, you first need to know the molecular weight of H2O, which is 18 g/mol. Then, divide the mass in grams of the sample of H2O you would like to calculate by the molecular weight of H2O, which is 18 g/mol, to find the moles of H2O.

For example, if you had a sample of 90 g of H2O, you would divide 90 g by 18 g/mol to find the moles of H2O, which is 5 moles. Therefore, the sample of 90 g of H2O would contain 5 moles of H2O.

## What are 2 moles of H2O?

2 moles of H2O is equal to 1. 758 × 10^24 molecules of H2O, or 18. 0153 grams of H2O. Because a mole is a unit of measurement for a substance, it is equal to 6. 022×10^23 of that substance. In the case of H2O, this means 6.

022×10^23 molecules of H2O. Therefore, 2 moles of H2O is equal to 1. 758 × 10^24 molecules of H2O, or 18. 0153 grams of H2O.

## How do you calculate H2O?

To calculate the molecular weight of H2O (water), you need to know the atomic weights of the two atoms that make up a water molecule. These weights are 1. 00783 for hydrogen (H) and 15. 9994 for oxygen (O).

To calculate the molecular weight of H2O, we multiply the atomic weight of hydrogen (1. 00783) by two (since there are two atoms of hydrogen in a water molecule), and then we add it to the atomic weight of oxygen (15.

9994). So, the molecular weight of H2O is calculated as follows: (1. 00783 x 2) + 15. 9994 = 18. 01528.

## How do you convert grams to moles?

In order to convert grams to moles, you will need to use the mole unit conversion factor: 1 mole = 6. 222 x 10^23 molecules. This is also known as Avogadro’s number. Firstly, calculate the number of molecules for the given mass of the substance by dividing the given mass (in grams) by the molar mass of the substance.

Then, multiply the result by the Avogadro’s number to get the number of moles. For example, if the given mass is 6 grams of carbon, then the number of molecules can be calculated as 6 g/ 12 g/mol = 0.

5 mol. Then, multiplying it by Avogadro’s number results in 3. 111 x 10^23 molecules of carbon. So, the number of moles for 6 grams of carbon is 0. 5 mol.

## What is the mass of oxygen in 72 g of water?

The mass of oxygen in 72 g of water is approximately 32 g. This calculation is based on the fact that a molecule of water (H2O) is composed of two hydrogen atoms and one oxygen atom. The molar mass of water (H2O) is 18.

015 g/mol, which means that if you have 72 g of water, you will have approximately 4 moles of water (72 g / 18. 015 g/mol = 4 moles). Since each mole of water is composed of two moles of hydrogen and one mole of oxygen, then you will have 2 moles of hydrogen and 1 mole of oxygen.

The molar mass of oxygen (O2) is 32 g/mol, which means that 1 mole of oxygen has a mass of 32 g. Therefore, the total mass of oxygen in 72 g of water would be approximately 32 g (1 mole of oxygen x 32 g/mol = 32 g).

## Which has more molecules 1 mole of H2O?

One mole of H2O has 6. 022 x 10^23 molecules. This is a very large number of molecules and is equivalent to Avogadro’s number. It is considered to be a massive number and is used to measure other quantities in scientific calculations.

For example, one mole of any substance contains the same number of atoms or molecules. Therefore, with one mole of any substance, there would be 6. 022 x 10^23 molecules present.