How many molecules of water and oxygen atoms are present in 0.9g of Water. this numerical is based on Mole Concept. Kindly solve it!!!

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You need to solve for the right answer for this problem.

a) 18 g of water = 1 g-mol = 6.022x10^23 molecules of water

so, 0.9 g of H2O contain 3.011x10^22 molecules of water.

b) Since 1 molecule of water contain 1 atom of oxygen

So, 0.9 g of water contain 3.011x10^22 atoms of oxygen.

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To determine the number of water molecules and oxygen atoms in 0.9g of water, we need to use the concept of moles.

The first step is to calculate the number of moles of water present in 0.9g. For this, we need to know the molar mass of water.

Water (H2O) has a molar mass of approximately 18 g/mol (2g for 2 H atoms + 16g for 1 O atom).

Now, we can use the formula:

Moles = Mass / Molar mass

Moles of water = 0.9g / 18 g/mol = 0.05 mol

The molar ratio of water to oxygen atoms is 1:1. This means that for every water molecule, there is one oxygen atom.

Therefore, the number of water molecules in 0.9g of water is equal to the number of moles:

Number of water molecules = Number of moles of water = 0.05 mol

Now, to find the number of oxygen atoms, we need to multiply the number of water molecules by the number of oxygen atoms in each water molecule.

Each water molecule contains one oxygen atom.

Number of oxygen atoms = Number of water molecules = 0.05 mol

Alternatively, we can also use Avogadro's number to find the number of molecules and atoms:

Number of water molecules = Number of moles of water * Avogadro's number
= 0.05 mol * 6.022 × 10^23 molecules/mol

Number of oxygen atoms = Number of moles of water * Avogadro's number
= 0.05 mol * 6.022 × 10^23 atoms/mol

Therefore, in 0.9g of water, there are approximately 0.05 moles, 0.05 moles, 6.022 × 10^23 molecules, and 6.022 × 10^23 atoms of water and oxygen, respectively.

You might try reading what you post. The question, as is, doesn't make sense. I'm sure you meant to write, "How many molecules of hydrogen and oxygen atoms .....".

How many moles are in 0.9 g H2O. That will be moles = grams/molar mass.
Convert moles H2O to molecules remembering that there are 6.022 x 10^23 molecules in a mole.

Since there is 1 atom of oxygen per molecules, that will be the number of atoms of oxygen. The atoms of hydrogen will be twice that.