Advertisements
Advertisements
Question
Calculate the number of molecules in one Kg of calcium chloride.
Advertisements
Solution
Molecular mass of CaCl2 = 40 + (35.5 x 2) = 111
111 g of CaCl2 contain molecules= 6.02 x 1023
∴ 1kg = 1000 g of CaCl2 contain molecules
= `602/(111 xx 100) xx 1000 xx 10^23`
= `6020/111 xx 10^23`
= 5.42 x 1024
RELATED QUESTIONS
How many moles are 3.6 g of water ?
If 16 g of oxygen contains 1 mole of oxygen atoms, calculate the mass of one atom of oxygen.
How many moles are represented by 100 g of glucose, C6H12O6 ? (C = 12 u, H = 1 u, O = 16 u)
Deduce the number of molecules of the following compound in the given quantity.
32g oxygen
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.
Find the number of moles in 10 g of CaCO3.
Which of the following weighs the least?
Solid ammonium dichromate decomposes as:
\[\ce{(NH4)2Cr2O7 -> N2 + Cr2O3 + 4H2O}\]
If 63 g of ammonium dichromate decomposes. Calculate the quantity in moles of (NH4)2Cr2O7.
One mole of any gas occupies ______ ml at S.T.P.
The difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron.
