10. A gardener needs 2000ml of insecticide solution with a concentration of 7.0% by volume concentration. The volume of the solution is...

Question

A)3.5x10^1ml
B)1.4x10^2ml
C)2.0x10^3ml
D)1.4x10^4ml

12. A student dissolves 45.2 g of Mg(OH)2(s) in enough water to make 1.00 L. The concentration of the solution is
A) 4.52 mol/L
B) 1.00 mol/L
C) 0.775mol/L
D) 0.109 mol/L

I got A for both of these questions, is that right? thanks

Answer 1

No

Answer 2

0.07 * 2000 = ?

Answer 3

Mg = 24.3 g/mol
O = 16
H = 1
so Mg(OH)2 = 24.3 + 32 + 2 = 58.3 g/mol
so 45.2 /58.3 = 0.775 mols

Answer 4

help!!!