Question

Some amount of water is evaporated from a 2.0 L, 0.2 M NaI solution, to from a 1.0 L solution. The molar mass of NaI is 150 g/mol.

What is the final concentration of NaI solution in?

A. 30 g/L
B. 15 g/L
C. 60 g/L
D. 45 g/L

Answer 1

half the volume of solution with the same amount of NaI means the concentration is doubled

there are 0.4 moles of NaI in the liter of solution

Answer 2

sooo D?

Answer 3

150 g/mole * 0.4 moles/L = ? g/L

Answer 4

My guess it 60 g / L

Answer 5

*it's