If the density of alcohol is 0.79 g/ml, what is the mass in grams of 1.0 l of alcohol?

The mass of alcohol is 790 grams.

Explanation:

To calculate the mass of alcohol, we use the equation:

Volume of alcohol = 1.0 L = 1000 mL    (Conversion factor:  1 L = 1000 mL)

Density of alcohol = 0.79 g/mL

Putting values in above equation, we get:

Hence, the mass of alcohol is 790 grams.

n2(g) + 3h2-> 2nh3(g)   this is the balanced equation

note the mole ratio between n2, h2 and nh3.   it is 1 : 3 : 2   this will be important.

moles n2 present = 28.0 g n2 x 1 mole n2/28 g = 1 mole n2 present

moles h2 present = 25.0 g h2 x 1 mole h2/2 g = 12.5 moles h2 present

based on mole ratio, n2 is limiting in this situation because there is more than enough h2 but not enough n2.

moles nh3 that can be produced = 1 mole n2 x 2 moles nh3/mole n2 = 2 moles nh3 can be produced

grams of nh3 that can be produced = 2 moles nh3 x 17 g/mole = 34 grams of nh3 can be produced

note:   the key to this problem is recognizing that n2 is limiting, and therefore limits how much nh3 can be produced.

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