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## How many moles are present in 4 gram of O2?

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}.

## How many moles of O2 are in 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 4 grams?

If there are 2g dyhydrogen per mole, and we have 4g, then we know 4g / 2g per mole = 2 mole dihydrogen in 4g. To convert between moles and number of molecules or atoms, you need to use Avogadro’s number, which is 6.022^{23}, or 6 with 23 zeros.

## How many moles are in O2?

One mole of oxygen gas, which has the formula O_{2}, has a mass of 32 g and contains 6.02 X 10^{23} molecules of oxygen but 12.04 X 10^{23} (2 X 6.02 X 10^{23}) atoms, because each molecule of oxygen contains two oxygen atoms.

## How many molecules are there in 4 gram of O2?

We know that 32g of oxygen contain 6.022 × 10^{23} molecules. Hence, 4g of oxygen have 7.52 × 10^{22} molecules.

## How many atoms of oxygen are present in 4 moles of oxygen?

For one mole atoms of oxygen mass of [{text{N}}{{text{O}}_2}] will be [23{text{ g}}] and for 4 moles it will be [4 times 23{text{ g}} = 92{text{ g}}]. Hence 4 moles of oxygen atoms are present in 92 g of [{text{N}}{{text{O}}_2}]. Thus, option B is the correct answer.

## What is the molar mass of o2?

Since, the given sample contains hydrogen gas, we must consider the molecular structure of hydrogen, i.e. molecular mass = 2 amu. Hence the weight of one mole of hydrogen gas is 2 grams. Since the given sample weighs 4 grams, we can say that the number of moles of hydrogen present is 2 moles.

## How many grams is a mole?

The mass of one mole of a substance is equal to that substance’s molecular weight. For example, the mean molecular weight of water is 18.015 atomic mass units (amu), so one mole of water weight 18.015 grams.

## How many grams are in 1 mole of oxygen?

The mass of oxygen equal to one mole of oxygen is 15.998 grams and the mass of one mole of hydrogen is 1.008 g.

## How many moles of oxygen are in CO2?

A mole of CO2 molecules (we usually just say “a mole of CO2”) has one mole of carbon atoms and two moles of oxygen atoms. The atom ratio and the mole ratio of the elements are identical! 1-).

## How many grams are in 3.5 moles of oxygen?

So,3.5 moles of oxygen has mass=3.5×16=56grams.