Calculate the formula unit mass of Ca(HCO3)2
Answers
mass of ca= 40u
mass of h=1u
mass of c=12u
mass of o =16u
formula unit mass of Ca(HCO3)2 is 40+(1+12+16*3)*2=162
Given: Ca(HCO3)₂ Calcium bicarbonate
To Find: Its formula unit mass
Solution:
The following information can be noted from the modern periodic table:
The atomic mass of Calcium(Ca) is 40 u
The atomic mass of Hydrogen(H) is 1 u
The atomic mass of Carbon(C) is 12 u
The atomic mass of Oxygen(O) is 16 u
From the chemical formula of calcium bicarbonate [Ca(HCO3)₂ ], we see that
One formula unit of Calcium bicarbonate consists of 1 atom of Calcium, 2 atoms of hydrogen, 2 atoms of carbon, 6 atoms of oxygen
Mass of formula unit of Ca(HCO3)₂ = 1x atomic mass of Ca +2xatomic mass of H + 2x atomic mass of C + 6x atomic mass of O
Mass of formula unit of Ca(HCO3)₂ = 40 + 2x 1 + 2x 12 + 6x 16
= 162u
Therefore, the mass of a formula unit of Ca(HCO3)₂ is 162u.