Question

calculate the number of atoms in16g of he? [atomic mass of He=4.0u]​

Answer 1

Answer: 4 molecules

Explanation: 1 mole contains 6.022×10*23 [10 raise to 23] molecules.

Atomic mass of helium=4u

So,16u/4u= 4 molecules

The molar mass of He is 4. So 16g = 4 molecules and 4×6.022×10*23= 2.049 ×10*23 molecules