Question

Calculate the molar mass of the following compounds?
A. Baking powder
B. Phosphorus molecule

Answer 1

Hint: Molar mass is the mass of one mole of any substance expressed in grams. One mole is the amount of substance that contains as many particles as that are present exactly in $12g$of carbon isotope $^{12}C$ . One mole of any substance contains Avogadro’s number of particles or entities.

Complete step by step answer:
Let us first find out the molar mass of baking powder;
The molecular formula for baking powder is $NaHC{O_3}$ . Sodium hydrogen carbonate is the chemical name for this compound
The molar mass of baking powder can be calculated from the atomic masses of sodium, hydrogen, carbon and oxygen. The molar mass is expressed in $gmo{l^{ - 1}}$ .So the calculation can be done as follows-
$Molar\,mass = \,23 + 1 + 12 + (3 \times 16) = 84gmo{l^{ - 1}}$
Since the atomic masses of sodium, hydrogen, carbon and oxygen are $23,1,12,16u$ respectively . Nowadays $amu$ is replaced by $u$ . It denotes unified mass.
Phosphorus molecule:
The formula of phosphorus molecules is ${P_4}$ . The atomic mass of phosphorus is $31u$ . So the molar mass can of phosphorus molecule can be calculated as-
$Molar\,mass = 4 \times 31 = 124gmo{l^{ - 1}}$ .

So the molar mass of baking powder and phosphorus molecules are $84\,and\,124gmo{l^{ - 1}}$ .

Additional information:
$amu$ is an atomic mass unit. One atomic mass unit is known as a mass exactly equal to one-twelfth of the mass of one carbon $ - 12$ atom.
Molar mass is always expressed in $gmo{l^{ - 1}}$ .
The baking powder is a mixture of carbonate or bicarbonate and a weak acid, it is also a dry chemical leavening agent.

Note: Phosphorus molecule has tetrahedral structure. Phosphorus can exist in several allotropes. Some of them are red phosphorous, white phosphorous, black phosphorus. Allotropes are the different structural forms of an element having different physical and chemical properties.