I guess you are asking what world should go at the beginning of the sentence. If I am right, it is energy.
Answer:
1)
(500.mL)(.200M)/.150M = 667 mL
667mL - 500mL = 167mL of water is needed
2)
1.0 L = 1000mL
M1 V1 = M2 V2
(1.6 mol/L) (175 mL) = (x)(1000mL)
x = .28M
Ionic compounds
Explanation:
D
A P E X
I think its A
sorry if im wrong
