Question

how many molecules are in 652 of h20?

Answer 1

Molecular weight of water (H₂O) is: Mw = 18.015 g/mole

Amount of substance is: n = m/Mw.

n = 652g / 18.015 g/mol = 36,19 mole

In chemistry and physics, the Avogadro constant (symbols: NA) is defined as the number of constituent particles (usually atoms or molecules) in one mole of a given substance. It has dimensions of reciprocal mol and its value is equal to 6.022×10²³ mol⁻¹.

If 1 mole includes 6.022×10²³ molecules, then 36,19 mole includes:

N = 36,19 * 6.022×10²³ = 2,18×10²⁵ molecules