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## How many moles is 4.00 grams of O2?

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Since oxygen has an atomic mass of 16 g/mole, the molar mass of oxygen gas (O2) is 2 x 16 g/mole = 32 g/mole. Since 1 mole of oxygen is equivalent to 32 g, 4 moles of oxygen gas would be equivalent to 4 moles x 32 g/mole = **128** g. Thus, 4 moles of oxygen gas (O2) would have a mass of 128 g.

## How many moles are in 4g of oxygen?

To calculate the number of molecules in 4g of oxygen, we have, Moles of oxygen = 4/32 = **0.125mol**, Molecules of oxygen = 0.125 * 6.022 * 10^{23} = 7.52 * 10^{22}.

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## How many moles of oxygen atoms are present in 4.0 g of the gas?

First, we need to calculate the molar mass of oxygen gas. Oxygen gas is O2 . O2 has a molar mass of 32g/mol . ∴ There are **1.25 moles of O2** in 40g of oxygen gas.

## How do I calculate moles?

So in order to calculate the number of moles of any substance present in the sample, we simply **divide the given weight of the substance by its molar mass**. Where ‘n’ is the number of moles, ‘m’ is the given mass and ‘M’ is the molar mass.

## Which contains more molecules 4 gram of methane ch4 4 gram of oxygen o2?

We already know the molecular mass of methane is 16 and the molecular mass of oxygen is32. Hence the number of molecules of methane is **twice** the number of molecules of oxygen.