Thursday

July 31, 2014

July 31, 2014

Total # Posts: 13

**Chemistry**

The density (in g/L) of CO2 at 444 torr and -6.0°C is __________. Express answer to three (thousandth) decimal places I dont know how to start this problem at all. Help please.

**Chemistry**

A sample of hydrogen gas (H2) was found to effuse at a rate equal to 6.7 times that of an unknown gas. The molecular weight of the unknown gas is __________ g/mol. Express your answer to one (tenth) decimal place.

**Chemistry**

The density (in g/L) of CO2 at 444 torr and -6.0°C is __________. Express answer to three (thousandth) decimal places.

**Chemistry**

A 20.9 L container filled with gas at 0.845 atm and 64.0°C contains __________ mol of gas. Express answer to three decimal places

**Chemistry**

What is the partial pressure (in mm Hg) of neon in a 4.00 L vessel that contains 0.442 mol of methane, 0.414 mol of ethane, and 0.859 mol of neon at a total pressure of 943 mm Hg?

**Chemistry**

A sample of gas (26.1 g) initially at 3.00 atm was compressed from 21.00 L to 6.00 L at constant temperature. After the compression, the gas pressure was __________ atm.

**Chemistry**

A balloon originally had a volume of 6.63 L at 86 °C and a pressure of 684 torr. The balloon must be cooled to __________°C to reduce its volume to 6.03 L (at constant pressure). Express answer to the tenth decimal place

**Chemistry**

For which one of the following reactions is the value of H°rxn equal to H°f for the product?

**Chemistry**

The value of H° for the reaction below is -482 kJ. Calculate the heat (kJ) released to the surroundings when 12.0 g of CO (g) reacts completely.

**Chemistry**

A 22.44g sample of iron absorbs 180.8J of heat, upon which the tempature of the sample increases from 21.1 C to 39.0 C. What is the specific heat of iron?

**Chemistry**

In a titration of 26.0 mL of 0.840 M H2SO4, __________ mL of a 0.200 M KOH solution is required for neutralization. Express your answer to the nearest 1/10 mL. Hint: remember H2SO4 is a diprotic acid

**Chemistry**

What volume (mL) of a concentrated solution of sodium hydroxide (2.00 M) must be diluted to 600.0 mL to make a 0.860 M solution of sodium hydroxide? Express your answer to the nearest tenth mL.

**Chemistry**

How many grams of CH3OH must be added to water to prepare 420.0 mL of a solution that is 5.0 M CH3OH?

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