Penjelasan:

1. Calculate mol of KCl if volume at standard condition is 3360 ml!

solution :

Mol of KCl

= Volume KCl / Volume molar standard

= 3,360 liter / 22,4 liter/mol

= 0,15 mol

2. Known Avogadro number = 6,02 x 1023 . Calculate :

a. Total atom of O in 0.2 mol KMnO4

b. Total molecules H in H2SO4 is 7.224 x 1023 molecules. Calculate mol of H2SO4!

solution :

a. total molecule of KMnO4

= mol . avogadro number

= 0,2 . 6,02 x 10^23

= 1,204 x 10^23 molecules

total atom O in 0,2 mol KMnO4

= 4 x 1,204 x 10^23

= 4,816 x 10^23 atoms

b. molecule H2SO4

= 7,224 x 10^23 / 2

= 3,612 x 10^23 molecules

mol H2SO4

= 3,612 x 10^23 / 6,02 x 10^23

= 0,6 mol

3. Calculate mol of 11.1 g Ca(OH)2!

solution :

Mol Ca(OH)2

= mass / molecular mass

= 11,1 g / 74 g/mol

= 0,15 mol

4. Calculate the mass of 500 ml HNO2 0.2 M!

solution :

calculate mol HNO2

= [HNO2] / volume liter

= 0,2 M / 0,5 liter

= 0,4 mol

mass of HNO2

= mol . molecular mass

= 0,4 mol . 47 g/mol

= 0,008 grams