Question

please help! i have no idea what to do!
1. What is the solubility product expressed algebraically for this equation? Mg3(PO4)2↔ Mg + 2PO4
a) x^2 b) 4x^3 c) 108x^5 d) 27x^4 e) 9x^3
2. what is the concentration of aluminum ions if the solubility product constant of Al(OH)3 is 27x10^-32 A) 1x10^-32 B)1x10^-16 C) 1x10^-8 D) 1x10^-4
3. The solubility product of Fe(OH)3 is 3.98x10^-38 what is the concentration of hydroxide ions in a saturated solution? A) 1.96x10^-10 B)5.88x10^-10 C) 3.91x10^-10
D) 7.84x10^-10
4. 2H2 + O2 ↔ 2H2O
keq=3 if concentration is [0.5M] and O2 is [0.7M] what is the H2O concentration at equilibrium? A)1.050 B)1.025 C).850 D).725
5. what is the equilibrium constant for the following reaction?
4Na+O2 ↔ 2Na2O
a) [Na][O2]/ [Na2O]
b)[Na2O]/[Na][O2]
c)[Na]^4[O2]/[Na2O]^2
d) [Na2O]^2/[Na]^4[O2]
Thank you so much!

Answer 1

the first would be 108x^5 this is because (3x)^3*(2x)^2 = 108x^5

Answer 2

thank you so much!