Question

Question 6

Answer 1

The molecular weight of the substance is 30.46 g/mol.

What is molar mass?

Molar mass can be defined as the mass is divided by the number of moles of the substance.

Step 1: calculating the moles

Given, the mass is 177 g

Pressure is 1.18 atm.

The volume is 2.30 L

By the formula of ideal gas

$\rm PV = nrt\\1.18 \times 2.30 = n \times 8.312 \times 10^-^2 \times 19.0\\\\n = \dfrac{8.312 \times 10^-^2 \times 19.0}{1.18 \times 2.30} = 0.581 \;mol$

Step2 -calculate the molecular weight

The moles are 0.581

$\rm Molar\;mass = \dfrac{mass}{number\;of\;moles} \\\\\rm Molar\;mass = \dfrac{17.7g}{0.581} = 30.46$

Thus, the molecular weight is 30.46 g/mol

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