Engineering Board Exam Reviewer · Chemistry · medium
What is the molality of a solution containing 9 g of glucose ( C6H12O6) in 500 g of water? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5, Ca = 40)
- 0.05 m
- 18.00 m
- 0.01 m
- 0.10 m
Answer
D. 0.10 m
Solution
n = 9/180 = 0.05 mol. m = 0.05/0.5 kg = 0.10 mol/kg.
More Chemistry questions
- 50 mL of a 4 M solution is diluted to 200 mL. What is the new concentration?
- How many mL of 6 M HCl are needed to prepare 300 mL of 2 M HCl?
- How many grams of NaCl are needed to prepare 250 mL of a 0.2 M solution? (Use H = 1, C = 12, N = 14, O = 16, Na = 23, S = 32, Cl = 35.5…
- What is the molarity of a solution prepared by dissolving 20 g of NaOH in enough water to make 500 mL of solution? (Use H = 1, C = 12, N =…
- A gas at 1 atm and 300 K is heated in a rigid container to 600 K. What is the final pressure?
- Air is 21% oxygen by mole. What is the partial pressure of oxygen when the total pressure is 760 mm Hg?
- How many times faster does hydrogen (M = 2) effuse than oxygen (M = 32) under the same conditions?
- A gas has a density of 1.25 g/L at STP (273 K, 1 atm). What is its molar mass? (R = 0.08206 L· atm/mol· K)
- What is the pressure exerted by 0.5 mol of gas in a 5 L container at 273 K? (R = 0.08206 L· atm/mol· K)
- What volume is occupied by 2 mol of an ideal gas at 300 K and 1 atm? (R = 0.08206 L· atm/mol· K)