ChemistryNEET 2024Mole concept and molar mass

Some Basic Concepts of Chemistry

The highest number of helium atoms is in:

A.4 u of helium
B.4 g of helium
C.2.271098 L of helium at STP
D.4 mol of helium✓

Solution

One mole contains $6.022 \times 1 0^{23}$ atoms, so 4 mol has the most. 4 g of He is 1 mol; 22.71 L at STP is 1 mol, so 2.271 L is 0.1 mol; 4 u is a single atom.

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