Question

Calculate the mass of sample of calcium carbonate containing 5.5 x 10^23 atoms

A. 18.29 g
B. 91.44 g
C. 6.02 x 10^23g
D. not enough information

which one is it?? thank you

Answer 1

No of moles:-

• No of molecules/Avagadro no
• 5.5×10²³÷6.022×10²³
• 0.91mol

Now

molar mass:-

• CaCO_3
• 40+12+48
• 100g/mol

Mass:-

• 100(0.91)
• 91g

Option B