1. Which of the following represents a 0.100 mol/L KCI solution? a. b. c. d. 100

Question

1. Which of the following represents a 0.100 mol/L KCI solution? a. b. c. d. 1000 mL of solution containing 74.6 g KCI 100 g KCI in 1.00 L of solution 5.00 L of solution containing 373 g KCI 7.46 mg KCl per mL of solution 2. A gas mixture of Ar(g), N,(g) and O,(g) has a total pressure of 0.950 atm and occupies a volume of 90 K. What is the mass of N,(g) present, if the partial pressure of Arlg 2.00 L when its temperature is 2 is 0.450 atm and the partial pressure of O,(g) is 0.210 atm? a 1.77 g b. 2.44 g c. 0.683 g d. 0.571 g You place a 4.00 kg iron bar (specific heat capacity, C: 0.4 water at 23.0 (density = 0.998 g/mL, C, = 4.184 J/gC). After several minutes, the temperature of the water is 28.7 'C. What was the initial temperature of the iron bar? a. 41.3 3. 73 J/gC) in a beaker containing 1 00 kg of b. 16.1 34.8 d. 63.2 c. Neutral atoms with the outer electron configuration ns'np in their lowest energy (ground) states belong to the group with elements: 4. B, Al, Ga, In b. Li, Na, K, Rbc. Cu, Ag, Au d. Sc, Y, La PROBLEM SESSIONS PS-9

Explanation / Answer

Ans 1 : d) 7.46 mg KCl per mL of solution

7.46 mg per mL of solution will have a total of 7.46 g of KCl in 1 L of the solution.

n = 7.46 / 74.6 = 0.1 mol

Molarity = no. of moles of KCl / volume of solution in L

M = 0.1 / 1

M = 0.100 M

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