Calculate the mass fraction of each element in the formula lead nitrate (2).

Lead nitrate has the chemical formula Pb (NO3) 2;

To solve this problem, it is necessary to find the ratio of the molar masses of identical atoms to the molar mass of the molecule.

Let’s find the molar mass of lead nitrate (2):

M Pb (NO3) 2 = 207 + 14 x 2 + 16 x 6 = 331 grams / mol;

K Pb = 207/331 = 0.6254 = 62.54%;

K N = 14 x 2/331 = 0.0846 = 8.46%;

K O = 16 x 6/311 = 0.2900 = 29%;

Examination:

62.54 + 8.46 + 29.00 = 100.00%;