Question

Q30) a) Calculate the molecular mass of FeCl3
If atomic mass of Fe=53u and Cl= 35.5u
b) Write the chemical formula of calcium carbonate.​

Answer 1

Answer:

(a) 159.5 u

(b) CaCo3

Explanation:

(a) molecular mass is sum of atomic masses of atoms present in the molecule.

FeCl3 is the molecule(atoms combination in simple words).

Fe, Cl are two atoms.

And in this molecule we have 1 Fe and 3 Cl.

Atomic mass

Fe-53u

Cl-35. 5u

Molecular mass

FeCl3=53+35.5+35.5+35.5=159.5u

For more information,atomic mass can be known

if we know atomic no. for some elements atomic no. twice is atomic mass.

(b) 3 should come below O.