Friday
July 3, 2015

Homework Help: Chemistry (Check)

Posted by Bryan on Monday, February 5, 2007 at 3:01pm.

Part B True-False
Classify each of the statements as always true, sometimes true, or never true.

1.____ST______ one mole of any gas occupies a volume of 22.4 L.
2_____NT______ for a substance of known molar mass, the number of moles of a sample can be calculated from the mass of the sample.
3_____AT______ the volume occupied by one mole of a gas is dependent on the molar mass of the gas.
4______AT_____ the volume of a gas at STP can be calculated from the number of molecules of the gas.


2, 3 need rethinking.

ok on some. Poor on others. I don't want to fill in the blanks but I will write a paragraph on gases and mols.

The mass occupied by a mole of ANY gas at STP is 22.4 L and contains 6.02 x 10^23 particles. It will be some other volume at non standard conditions; therefore, 1 and 4 are ok but you may want to rethink 3.

The mols of a substance can be calculated from mols = grams/molar mass. This is always true.

i put alaways true for number 3. What about number 2?

The answer for 2 lies in what I wrote previously. "The mols of a substance can be calculated from mols = grams/molar mass. This is always true."

The asnwer to #2 also is contained in what I wrote earlier. "The mass occupied by a mole of ANY gas at STP is 22.4 L and contains 6.02 x 10^23 particles. It will be some other volume at non standard conditions; therefore, 1 and 4 are ok but you may want to rethink 3."




Number three: THe volume of a gas does not depend on the molar mass of the molecules.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Members