Question

Molar mass

18 Calculate the molar mass of lead element, knowing that the mass of 0.2 mol
of it equals 41.4 g​

Answer 1

The molar mass of lead is calculated by dividing the mass of the sample (41.4 g) by the number of moles (0.2 mol), resulting in 207 g/mol. This value is confirmed by the periodic table where the molar mass of lead is listed as 207.2 g/mol.

Step-by-step explanation:

To calculate the molar mass of the lead element, we use the formula:

Molar mass = Total mass of the sample in grams / Number of moles of the sample

Given that 0.2 moles of lead have a mass of 41.4 g, we can find its molar mass by dividing the mass by the number of moles.

Molar mass of lead = 41.4 g / 0.2 mol = 207 g/mol

This result aligns with the known molar mass of lead. By consulting the Periodic Table of the Elements, we can confirm that the molar mass of lead (Pb) is indeed 207.2 g/mol, which is very close to the calculated value, indicating that our calculation is accurate.

Answer 2

207g/mol

Step-by-step explanation:

Given parameters:

Mass of the lead = 41.4g

Number of moles = 0.2mole

Unknown:

Molar mass of lead = ?

Solution:

The molar mass of substance is related to mass and number of moles using the expression below;

Mass = number of moles x molar mass

Molar mass =
`(mass)/(number of moles )`

Now insert the parameters and find the molar mass;

Molar mass =
`(41.4)/(0.2)` = 207g/mol