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A determination calls for 125cm3 of glacial acetic acid .what mass of the acid is equivalent to the required volume
a)20.8g
b)62.5g
c)116.8g
d)132.3
In a reversible reaction Co2+H2--->H2O+Co ,the concentration of Co2 is 0.70 Moles per dm3 and of H2 is 80.38 mole per dm3 and the concentrations of Co and H2O are each 9.46 moles per dm3.What is the value of the equilibrium constant K
A)0.168
B)0.233
C)0.628
D)1.591
what is the solubility, in moles per dm3 of co3^= ions in a saturated solution of silver carbonate Ag2Co2
a)1.15x10^-4
b)1.15x10^-6
c)2.48x10^-4
d)2.48x10^-6
What is the concentration of the H+ ions in a 0.001N KOH solution

a)10^-17
b)10^-11
c)10^-10
d)10^-3
how many cubic centimeters of concentrated nitric acid are needed to obtain a mass of 76g

a)14.2cm3
b)53.5cm3
c)76.0
d)107.9
a solution consisting of 290g of NaCl , was made up to a volume of 2500 cm3 with water. what is the normality of the solution? (use 58.4428 g as the molecular mass of NaCl)

a)0.504N
b)1.160N
c)1.985N
d)2.338N
1. Balence the fallowing equation: Fe(s)+O2(g)----> Fe2O3(s)

2. Balence the fallowing equation: NH3(g)+O2(g)----> N2(g)+H20(g)

3. Hydrogen and oxygen react with each other according to the equation:
2 H2(g)+O2(g)---> 2 H2O(g)
If 5.00 mol of O2 react with an unlimited amount of hydrogen, what amount (in moles) of H2O will be produced?

4. A sample of helium gas has a valume of 620. mL at a temperature of 500. K. If we decrease the temperature to 100. K while keeping the pressure consistent, what will the new volume be?
what will the oxidation potential of a ferrous-ferric system in which a ratio (Fe⁺⁺)/(Fe⁺⁺⁺) is 10
Describe briefly the function of the primary X-rays and the analysing crystal as they are used in X-ray spectrography?

this appeared in my qualitative analysis module
Consider the following system in equilibrium:
CuCO3 (s) ⇌ Cu2+ (aq) + CO32-(aq) Ksp = 1.4 x10-10
CO2 (g) ⇌ CO2 (aq) K1 = 3.4 x10-2
CO2 (aq) + H2O (l) ⇌ HCO3-(aq) + H+(aq) K2 = 4.7 x10-7
HCO3-(aq) ⇌ CO32-(aq) + H+(aq) K3 = 5.1 x10-11
At equilibrium, the pH of the solution is equal to 5.745 when the system is
saturated with CuCO3. In standard conditions (pressure of 1 bar), calculate how
many grams of copper are contained in 1.54 L of water (assume density is 1
kg/L).