Advertisements
Advertisements
Question
Find the number of moles in 10 g of CaCO3.
Solution
Molecular mass of CaCO3 = 40 + 12 + (16 × 3)
= 100 g
100 g of CaCO3 = 1 mole
∴ 10 g of CaCO3 = `1/100 xx 10`
= 0.1 mole
APPEARS IN
RELATED QUESTIONS
Calculate the molar mass of the following substance:
Ethyne, C2H2
What is the mass of 0.2 mole of oxygen atoms?
The ratio of moles of atoms in 12 g of magnesium and 16 g of sulphur will be :
Calculate the number of molecules in 12.8g of sulphur dioxide gas. Take Avogadro's number as 6 x 1023.
[S = 32, 0 = 16 ]
A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure.
(a) Find the number of moles of hydrogen present
(b) What weight of CO2can the cylinder hold under similar conditions of temperature and pressure? (H = 1 C = 12, O = 16)
(c) If the number of molecules of hydrogen in the cylinder is X, calculate the number of CO2 molecules in the cylinder with the same conditions of temperature and pressure.
(d) State the law that helped you to arrive at the above result.
Calculate the number of moles of CO2 which contain 8.00 g of O2
Calculate the mass of 0.1 mole of the following:
Mg
(Ca = 40, Na = 23, Mg = 24, S = 32, C = 12, Cl = 35.5, O = 16, H = 1)
Determine the number of molecules in a drop of water which weighs 0.09 g.
Calculate the number of moles in 1.51 × 1023 molecules of NH4Cl.
Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of magnesium is 24g mol–1.
