VIOUS

Namella

Part 1: Molar Mass

Use the periodic table to find the molar masses of the following

HCI

K2CO₃

Ca (OH) 2

Na3PO4

Molar mass:

Molar mass of substance is sum of atomic weight of all the atoms of elements present in it.

HCl

Atomic weight of hydrogen = 1.008 amu

Atomic weight of chlorine = 35.5 amu

Atomic weight of HCl = 1.008 + 35.5 = 36.508 g/mol

K₂CO₃:

Atomic weight of potassium = 39.0893 * 2 = 78.1786 amu

Atomic weight of carbon = 12 amu

Atomic weight of oxygen = 16*3 = 48 amu

Atomic weight of K₂CO₃ = 48+12 + 78.1786 = 138.178 g/mol

Ca (OH) ₂:

Atomic weight of calcium = 40 amu

Atomic weight of oxygen = 16 * 2 amu = 32 amu

Atomic weight of hydrogen = 1.008 * 2 = 2.016 amu

Atomic weight of Ca (OH) ₂ = 74.016 g/mol

Na₃PO₄:

Atomic weight of sodium = 23*3 = 69 amu

Atomic weight of phosphorus = 31 amu

Atomic weight of oxygen = 16 * 4 = 64 amu

Atomic weight of Na₃PO₄ = 69+31+64 = 164 g/mol