Advertisements
Advertisements
Question
Calculate the number of moles and number of molecules present in 1.4 g of ethylene gas. What is the volume occupied by the same amount of ethylene?
Advertisements
Solution
Molecular mass of ethylene (CH2-CH2) = 1.4 g
Number of moles = `"Mass"/"Molecular mass"`
= `1.4/28`
= 0.05 moles
Now, number of molecules in 1 mole = 6.023 × 1023
∴ Number of molecules in 0.05 moles = 6.023 x 1023 × 0.05
= 0.3 × 1023
= 3 × 1022 molecules
Volume occupied by 1 mole of ethylene = 22.4 L
∴ Volume occupied by 0.05 moles of ethylene = 22.4 × 0.05
= 1.12 L
APPEARS IN
RELATED QUESTIONS
What is the mass of 0.5 mole of water molecules?
How many moles are 3.6 g of water ?
How many moles of calcium carbonate (CaCO3) are present in 10 g of the substance ? (Ca = 40 u ; C = 12 u ; O = 16 u)
Which of the following correctly represents 360 g of water ?
- 2 moles of H2O
- 20 moles of water
- 6.022 × 1023 molecules of water
- 1.2044 × 1025 molecules of water
A sample of ammonium nitrate when heated yields 8.96 litres of steam (measured at STP)
NH4NO3 → N2O + 2H2O
What mass of ammonium nitrate should be heated to produce 8.96L of steam?
Find the number of molecules in 3.2 g of SO2.
Calculate the number of moles of methane in 0.80 g of methane.
The molecular formula for elemental sulphur is S8.In a sample of 5.12 g of sulphur:
How many molecules and atoms are present?
If 0.2 mol of the following substance is required how many grams of that substance should be taken?
magnesium oxide
If 0.2 mol of the following substance is required how many grams of that substance should be taken?
Calcium carbonate
