General Chemistry Answers

The concentrated sulfuric acid we use in the laboratory is 98.0 percent H₂SO₄ by mass. Calculate the molality and molarity of the acid solution. The density of the solution is 1.83g/mL

Isooctane is a primary component of gasoline and gives gasoline its octane rating. Burning isooctane in a bomb calorimeter releases 330.0 kJ of heat; the temperature in the bomb increases from 23.20C to 66.50C. What is the heat capacity of the bomb calorimeter?

Copper has a specific heat of 0.382 J/g0C. The temperature of an unknown mass of copper increases by 4.500C when it absorbs 3.97 J of heat. What is the mass of the copper?

Why is ammonia is used to remove rust from metals

Considering the observed IMF and strength of those forces, complete the following questions with your best predictions.

1) Rank the following molecules from lowest to highest boiling point: H2, Br2, and F2. Explain your prediction based on IMF.

2) Predict which of the following has the highest boiling point: HF or HBr. Explain your prediction based on IMF.

3) Consider water, H2O. Predict how water’s boiling point compares to HBr and HF? Explain your prediction based on IMF.

4) Look up the boiling points of H2, H2O, Br2, F2, HBr, and HF. Were your predictions correct? Explain.

A solution prepared by adding 10g of an unknown non-volatile, non-electrolyte solute to 150 g of water. The Boiling point of the solution is elevated by 0.433 ⁰C above the normal boiling point of the solvent. What is the molar mass of the unknown substance?

1. How many grams of Lactic acid (C₆H₁₀O₅) should be dissolved in 650g of cyclohexane (C₆H₁₂) to raise the boiling point to 84.91⁰C? The normal boiling point of cyclohexane is 81⁰C and its molal boiling point is 2.75 ⁰C/m.

A piece of aluminum with a mass of 30 grams was heated in a steam jacket to 98 oC and then plunged into 120 grams of water at 9 oC, causing the temperature to rise to 13.5 oC. What is the specific heat of aluminum

An ice cube of mass 65 g is taken from a freezer at -15

oC and dropped into 125 cm3 of water at

85

oC. What will be the final temperature of the mixture? The specific heat of ice is 0.5 cal/g.oC

and latent heat of fusion of ice is 80 cal/g.

In an experiment designed to measure the heat of fusion of ice, 25 grams of ice at 0

oC is

dropped into 200 grams of water at 30

oC contained in a copper calorimeter of mass 100 g. The

final temperature is 17.5

oC. What value of the heat of fusion do this value yield? Specific

heat of copper = 0.0931 cal/gC

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