Homework Help: Chemistry

Posted by Casey on Saturday, July 10, 2010 at 5:34pm.

Last one I promise! Thankyou for bearing with me. This seems simple enough, but chemistry genuinely makes me feel retarded so I appreciate reassurance.

How many molecules of CH4 are there in 48.2g of the compound?

I'm assuming that I should just divide 48.2 g by the molar mass of CH4 which is 16.05g, and it calculates to 3 mols. Is this correct?

Chemistry - DrBob222, Saturday, July 10, 2010 at 5:40pm
If the question asked for moles, ok but it asked for molecules.
There are 6.022 x 10^23 molecules in a mole so 3.01 x 6.022 x 10^23 = # molecules. I would use 3.01 and not 3 since you have 3 significant figures in 48.2 and 4 in 16.05.
Chemistry - Casey, Saturday, July 10, 2010 at 5:43pm
Thankyou very much for clearing that up.
Chemistry - Anonymous, Tuesday, August 3, 2010 at 9:40am
The density of mercury is 13.54 g/cm3. Suppose you need 40 gm of mercury for an experiment. What volume of mercury do you need?

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