Answer:
4. B
5.
Step-by-step explanation:
When in aqueous solution, K2CrO4 dissociates into ions. It dissociates into:
K2CrO4 = 2K+1 + CrO4-1
We do as follows:
Molarity = mol / L = 0.38 g/g solution ( 1.37 g/mL ) ( 1 mol / 194.19 g ) ( 1 mol CrO4-1 / 1 mol K2CrO4 ) ( 1000 mL / 1 L ) = 2.68 M
Subtract 7 from each side
x=12
Answer:
first question z = 9
second question is not
third question h = 3 3/4
Step-by-step explanation:
50 x .40 = 20
50 - 20 = 30
approx. $30
