# What is the percentage of carbon dioxide in the atmosphere?

Carbon dioxide consists of a carbon atom covalently double bonded to two oxygen atoms. It occurs naturally in Earth's atmosphere as a trace gas at a concentration of about 0.04 percent (400 ppm) by volum.
A.

### What is the mass of a molecule of carbon dioxide?

Carbon dioxide has one carbon atom and two oxygen atoms, and a molecular weight of 44 grams per mole ( a certain number of molecules). The oxygen in the air is actually O2, or molecular oxygen, with a molecular weight of 32.
• #### What is the mass of 1 mole of hydrogen gas?

1 mole is equal to 1 moles H2, or 2.01588 grams.
• #### What is the mass of a mole of carbon?

1 mole of carbon. Exactly 12 grams of pure carbon-12 powder is known as one mole. The number of atoms of carbon-12 present in this one mole sample is 6.022 136 7 x 1023. This number is known as Avogadro's number.
• #### What is the mass of a nitrogen molecule?

Atomic mass of Nitrogen element is 14.0067 amu. Nitrogen molecule is N2, so molecular mass of nitrogen molecule is 2*14.0067 = 28.013. This means, every one mole of nitrogen gas weighs 28.013 grams and contains 602 hexillion molecules of N2.

Updated: 4th October 2019