What is the molar mass of a gas if it has a density of 1.75 g/l of stp?

39.2 g/mol.

The molar mass of a substance is the same as the mass of one mole of the substance.

Under Standard Temperature and Pressure, STP, the volume of one mole of an ideal gas is 22.4 liters. As a result, under STP the mass of one mole of this gas will be the same as the mass of 22.4 L of the same gas.

The density of this gas is 1.75 g/L. The mass of each liter of the gas is 1.75 grams. The mass of 22.4 L of the same gas will thus equal .

The mass of one mole or 22.4 L of this gas is 39.2 g. As a result, the molar mass of this gas is .

To generalize,

,

where

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

the answer is   c.) 1575 j.

explanation: