Question

How many hydrogen atoms are contained in 0.40 mL of water, given that the density of water is 1 g/ml?

Answer 1

2.676e22 atoms of Hydrogen

Step-by-step explanation:

Knowing the density of water is 1g/ml, 1(g/ml)*0.4ml=0.4 grams of H2O. Knowing that there are 16 grams of H2O in 1 mole of H2O, we can set up a unit conversion of 0.4 Grams H2O *
`(1 mol H_2O)/(18 grams H_2O)*(2 mol H)/(1 mol H_2O) *(6.022e23 atoms of H)/(1 mol H)`=

2.676e22 atoms of Hydrogen.