Chemistry Answers

B. A sample of neon gas at a pressure of 0.996 atm and a temperature of 28.9 °C, occupies a volume of 18.5 liters. If the gas is allowed to expand at constant temperature to a volume of 25.7 liters, the pressure of the gas sample will be ______ atm.

A. A sample of oxygen gas at a pressure of 0.986 atm and a temperature of 23.3 °C, occupies a volume of 563 mL. If the gas is compressed at constant temperature until it’s pressure is 1.47 atm, the volume of the gas sample will be ______ mL.

A mixture of methane and carbon dioxide gases, at a total pressure of 648 mm Hg, contains 2.03 grams of methane and 6.40 grams of carbon dioxide. What is the partial pressure of each gas in the mixture? PCH4 =

PCO2 =

how many grams of sodium are needed to produce 19.4 L of hydrogen gas according to the following reaction at 25 °C and 1 atm? Sodium (s) + water (l) > sodium hydroxide (aq) + hydrogen (g)

A gaseous hydrocarbon, in a volume of 23.4 L at 392 K and a pressure of 3.16 atm, reacts in an excess of oxygen to give 165.7 g of H2O and 404.7 g of CO2. Determine the molecular formula of the hydrocarbon

A 15.8 g mixture of H2S and C2H6 gases is burned in enough oxygen. After drying the products the mole fraction of SO2 in the mixture is found to be 0.25. What volume of 0.1M KMnO4 solution is necessary to react with the SO2 in the burning products?

SO2 + KMnO4 +H2O - - - > MnSO4 + K2SO4 +H2SO4

a) A solution was prepared by dissolving 0.02 moles ethanoic acid in

water to give 1 L of solution. What is the pH?

b) to this solution was added 0.008 moles of concentrated sodium

hydroxide (NaOH). What is the new pH? (In this question you may

ignore changes in volume due to addition of NaOH).

The boiling points of the hydrides of halogens are given below.

Compound HF HCl HBr HI

Boiling point (℃) 293 188 206 238

Discuss the variation in these boiling points in terms of intermolecular forces of attraction.

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Identify the polarity of HF, HCl, HBr, HI

5. What is the mass percent sucrose in a solution made by combining 365 g of a 8.90 percent sucrose by mass aqueous solution with 145 g of an 6.80 percent sucrose by mass aqueous solution? (5 points)

4. Glucose is a natural sugar that occurs in abundance. What is the mass percent of a solution formed from 148 g of glucose and 698 g of water? (5 points)