Advertisements
Advertisements
Question
Deduce the number of molecules of the following compound in the given quantity.
32g oxygen
Advertisements
Solution
Number of moles in O2 = `("Mass of O"_2 "in grams")/"Molecular mass of O"_2`
= `32/32`
= 1 mole
∴ 1 mole of O2 contains 6.022 × 1023 molecules.
∴ The number of molecules in 32 grams of oxygen is 6.022 × 1023.
APPEARS IN
RELATED QUESTIONS
Calculate the percentage of water of crystallization in CuSO4.5H2O
(H = 1, O = 16, S = 32, Cu = 64)
A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure
1) Find the number of moles of hydrogen present.
2) What weight of CO2 can the cylinder hold under similar conditions of temperature and pressure? (H = 1, C = 12, O = 16)
3) If the number of molecules of hydrogen in the cylinder is X, calculate the number of CO2 molecules in the cylinder under the same conditions of temperature and pressure.
4) State the law that helped you to arrive at the above result.
What name is given to the amount of substance containing 6.022 × 1023 particles(atoms,molecules or ions) of a substance ?
How many moles are 3.6 g of water ?
The ratio of moles of atoms in 12 g of magnesium and 16 g of sulphur will be :
Explain the term:
Mole
Define the term:
Relative molecular mass
Find the number of molecules in 1.8 g of H2O.
How many grams of Al are present in 0.2 mole of it?
How many grams of CO2 is present in 0.1 mole of it?
Calculate the number of moles of methane in 0.80 g of methane.
The number of molecules in 4.25 g of ammonia is ______.
Solid ammonium dichromate decomposes as:
\[\ce{(NH4)2Cr2O7 -> N2 + Cr2O3 + 4H2O}\]
If 63 g of ammonium dichromate decomposes. Calculate the quantity in moles of nitrogen formed.
1 mole of any substance contains ______ molecules.
One mole of any gas occupies ______ ml at S.T.P.
N2 + 3H2 → 2NH3
(The atomic mass of nitrogen is 14, and that of hydrogen is 1)
1 mole of nitrogen (______ g) +
3 moles of hydrogen (______ g) →
2 moles of ammonia (______ g)
How many grams are there in the following?
2 moles of the hydrogen molecule, H2.
How many grams are there in the following?
3 moles of chlorine molecule, Cl2.
Calcium chloride when dissolved in water dissociates into its ions according to the following equation.
\[\ce{CaCl2} (aq) → {Ca^{2+} (aq) + 2{Cl}- (aq)}\]
Calculate the number of ions obtained from CaCl2 when 222 g of it is dissolved in water.
