# CHEM HW NEED HELP ASAP WILL PAY 10 if you solve in less than an hour

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The gram solubility of pb(no3)2 is known to be 65g/100gH2O at 30 deg C

What is the molar solubility of this salt at this temperature

A 6.5M

B 2.15M

C 650 M

D 1.96 M

E 4.58 M

CH2O(g) + 2H2(g)=CH4(g) + H2O(g)

Determin the equilibrium constant for the reaction at 549K

Delta ΔH = -94.9 kJ

ΔS= -224.2 j/k

A.  481

B.  1.07E9

C.  2.08E-3

D.  9.35E-10

E.  1.94E-12

Calculate the pH of a solution formed by mixing 250.0 mL of 0.15 M NH4Cl with 100.0 mL of 0.20 M NH3. The Kb for NH3 is 1.8 x 10^-5

A.  9.13

B.  9.25

C.  9.53

D.  4.74

E.  8.98

A solid Salt, AB2 is dissolved in pure water

If the concentration of B is measured to be 3.5E-4 M

What is ksp

A.  2.14E-11

B.  1.23E-7

C.  4.29E-11

D.  6.25E-7

A 100.00 mL sample of 0.20 M HF is titrated with 0.10 M KOH.Determine the pH of the solution after the addition of 200.00 mL of KOH. The Ka of HF is 3.5 x 10-4

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