Question

How many atoms are present in:0.1 mol of sulphur18.g of water (H2O)0.44 g of carbon dioxide (CO2)

Answer 1

apply formula (moles × avogadro no.)

Answer 2

The number of atoms in the following compounds are 0.1xNa, 1xNa and 0.01xNa respectively.

For Avogadro's constant given as 6.022 x 10^(23), the number of atoms in one mole of a compound or element is always equal to Na. Now, the number of moles of sulphur is directly mentioned, and so, number of atoms is equal to 0.1xNa. For H2O and CO2, the mass in grams is provided. To find the moles, one must divide it by the gram atomic masses, and compute the number of atoms using Avogadro's constant (Na).