76 % (7 Review)
1. Which of the following concentration measures will change in value as the temperature of a solution changes?
[B] Mass percent
[D] Mole fraction
[E] All of these
2. What is the mole percent of ethanol (C2H5OH) in 180 proof vodka, which consists of 71.0 g of ethanol for every 10.0 g of water present?
3. If 2.00 g of helium gas and 4.00 g of oxygen gas are mixed together what is the mole fraction of helium in the solution?
4. 3.2 L of an aqueous solution containing 25.00 g of KCl dissolved in pure water is prepared. The molarity of the solution is:
[A] 7.8 M
[B] 0.10 M
[C] 0.93 M
[D] 1.0 M[E] 0.46 M
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