Tuesday
November 25, 2014

Homework Help: chemistry

Posted by Christina on Saturday, November 10, 2012 at 9:00am.

2. Sulfuric acid comes from the oxidation of sulfur. The stages of the reactions are given below:
S + O2 --> SO2 ∆H= -296.8 kj
SO2 + 1/2 O2 --> SO3 ∆H= -98.9 kj
SO3 + H2O --> H2SO4 ∆H= -130.0 kj
The typical plant produces 750 tons of H2SO4 per day. Calculate amount of heat produced by the plant per day.

3. Each of 2 front tires in the car is filled with a different gas. One tire contains 116 g of helium, another tire has 160 g of unknown gas. How many times heavier is a molecule of the unknown gas than an atom of helium?

4. Suppose you want to heat air in your house with methane (CH4). Assume your house has 275 m2 of floor area and that ceiling is 2.50 m from the floor. The air in the house has a molar specific heat capacity of 29.1 j/mol*K. Average molar mass of air is 28.9 g and the density of air at these temperatures is 1.22 g/L. How much of methane do you need to burn in order to heat the air in the house from 15.0 to 22.0 oC?

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