
Chemistry Quiz: The importance of Helium
Quiz by Omar Khorbatly
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Identify the type of bond in oxygen molecule.

Indicate the valence of oxygen atom.
Determine the atomic number of the element nitrogen.
A scuba diver has planned for deep-diving, for this purpose he filled hisbreathing bottle with a mixture of oxygen (O2) gas and 0.8g of helium (He) gas.
- Calculate the number of moles ofhelium gas filled in the bottle.
Given Mollar mass of He: 4 g/mol
Explain why the scuba diver has filled his breathing bottle with a mixture of helium gas and oxygen gas insteadof a mixture of nitrogen gas and oxygen gas.