Under which conditions does the molar volume of a gas decrease?
at 273 k and at 2.0 atm
at 273 k and at 0.5 atm
at 409.5 k and at 1.0 atm
at 546 k and at 2.0 atm

The correct answer is at 273 K and at 2.0 atm.

Explanation:

Volume of a gas depends on temperature and pressure of the gas. The laws used to relate volume with temperature and pressure are Charles' Law and Boyle's Law respectively.

Mathematically,

   (At constant pressure and number of moles)

As, the volume of the gas increases, the temperature of the gas also increases and vice-versa.

Mathematically,

    (At constant temperature and number of moles)

As, the volume decreases, the pressure of the gas increases and vice-versa.

So, for the volume to decrease, the temperature must be minimum and pressure must be maximum.

Hence, from the given options, the correct one is at 273 K and at 2.0 atm.

calculate how many grams of ammonia can be produced from 4.21 grams of

n2 + 3h2 = 2nh3

my answer:

25.0g n2 x (1 mol/ 28.0gn2) x (2 mol nh3/ 1 mol n2) x (17.0g nh3/ 1 molnh3) = 30.36g n2

25.0g h2 x (1 mol h2/ 2.00g h2) x (2 mol nh3/ 3 mol h2) x (17.0g nh3/ 1 mol nh3) = 141.67g h2

lr = n2