If the pressure volume and the number of moles in a gas are known which is needed to calculate the universal gas constant from ideal gas law

Temperature

Explanation:

If the pressure, volume, and number of moles of a gas are known than temperature is needed to be known to determine the general gas constant.

Formula:

PV = nRT

P = pressure

V = volume

R = general gas constant

T = temperature

n = number of moles

Example:

V = 2 L, P = 1 atm , T = 273 K , n = 0.09 mol

PV = nRT

R = PV/nT

R = 1 atm. 2L / 0.09 mol . 273 K

R = 2 L. atm / 24.57 mol. k

R = 0.082 atm. L / mol.k

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

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