Question

please answer fast and give correct answer​

Answer 1

Answer:

i) 80.06 g/mol

The molecular formula is SO3. Hereby we neglect any charge since the mass of an electron is so much smaller than that of the nucleus.

The fact that it's in a gaseous phase doesn't change it's mass.

In the periodic table we find:

S = 32.07 u

O = 16.00 u  

1 x S = 32.07 u

3 x O = 48.00 u  

SO3 = 32.07 + 48.00 = 80.07 u  

OR

80.07 g/mol

     ii) 100 g/mol

The Chemical formula of calcium carbonate ⟶CaCO3

Mass of Calcium⟶40

Mass of Carbon⟶12

Mass of Oxygen⟶16

Multiply mass of each element by number of atoms of that element

Add all the masses obtained after multiplication.⟶CaCO3

=1×40+1×12+3×16

=40+12+48

=100.