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Question

1- How many atoms of Chlorine are in 2.00 mol of NaCl?

2- How many grams of NaOH are needed to prepare 2.0 L of a 1.5 M NaOH solution?

Answer 1

1)

1 mol of NaCl would contain 6.02 x 10²³ Cl atoms, so 2 mol NaCl would contain 2 (6.02 x 10²³) Cl atoms.

2 (6.02 x 10²³) = 1.2 x 10²⁴ Cl atoms

2)

M = mol / L

1.5 M = mol / 2.0 L

3 = mol

3 mol NaOH x (39.997 g / 1 mol) = 119.991 g NaOH