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1. How many grams of H3PO4 is needed to prepare 550mL of a 0.31N solution? (assume all H+ enter reaction)
A. 5.6
B. 1.9
C. 1.7
2. Calculate the volume in, mililiters, of a 1.50M NaHCO3 solution that provides 28.0g NaHCO3
A. 500
B. 222
C. 0.222
3. In between 40oC and 50oC, a decrease in temperature will increase the solubility of Na2SO4
True
False
4. Calculate the N of 20g H3PO4 in 500ml of solution (assume all H+ enter solution)
A. 1.2
B. 4.1
C. 2.8
5. Calculate the M of a 4.1m KCl solution if it's density is 1.10g/ml
A. 3.0
B. 29
C. 3.5
6. The mass percent, %(m/m), for 55.0g KOH in 178.0g H2O is:
A. 55
B. 24
C. 178
D. 31
If a 2.743g sample of MgSO4.7H2O were heated strongly,what would be the expected mass of the cooled dehydrated salt
The equilbrium constant for the decompositon at 25 degrees C is 2.3 X 10 ^ -4. At 25 degrees C , 7.5 g of NH4CO2NH2 is sealed in a 10 L flask and allowed to decompose.
A current of 11.3 A is applied to 1.25L of a solution of .552M HBr converting some of the H+ to H2(g).
When 5.19g of NaCl is dissolved in 85.0 mL of water at 22.2 degrees Celsius, the temperature of water drops by 6.6 degrees Celsius. Calculate the heat of solution of NaCl.
Suppose 312 grams of methylamine and 475 grams of oxygen are mixed together. How many grams of water should be produced?
A graduated cylinder contains 152 mL of water. A 14.0 g piece of iron (density = 7.86 rm{g/cm^3}) and a 16.0 g piece of lead are added. What is the new water level in the cylinder?
A dancehall contains 173 men and 238 women. A certain "promenade" calls for the formation of groups, with each group consisting of one man with two women.
Calculate the heat required to raise the temperature of 125 g of water are heated from 20.0oC to 100oC based on a specific heat of water of 4.184 J/g oC.
Mixing 1.0 M BaCl2 + 1.0 M K2SO4 gives what white participate. Write and balance the molecular equation.
A student measures the conductivity of an Fe2(SO4)3 solution and determines it to be a strong electrolyte. The student incorrectly lists the species in solution as O-2, S-2, Fe+3. Give the correct list of species in the solution.
What is the mol fraction Na2SO4 in a solution which is 11.5% by weight Na2SO4 (molar mass Na2SO4 = 142.06 g/mol and H2O = 18.016 g/mol)?
calculate change of pH value when we add 100mL of 0,4M HCl to 100mL of 0,4M NH3. K(NH3)
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