Assignment - 2 Some Basic Concepts of Chemistry | Class 11th

Assignment - 2

Mole Concept

Que 2. Find

i). Number of moles in 46 grams of sodium (Na)

ii). Number of moles in 100 gm of Chlorine (Cl₂)

iii). Number of moles in 54 grams of phosphorus (P₄)

iv). Number of moles in 49 grams of sulphuric acid (H₂SO₄)

v). Number of moles in 25 gm of CaCO₃ (calcium carbonate)

Que 3. According to nutritional guidelines from the US Department of Agriculture, the estimated average requirement for dietary potassium is 4.7 g. What is the estimated average requirement of potassium in moles?

Que 4. A litre of air contains 9.2 × 10^-4 mol argon. What is the mass of Ar in a litre of air?

Que 5.  Copper is commonly used to fabricate electrical wire.  How many copper atoms are in 5.00 g of copper wire?

Que 6. A packet of an artificial sweetener contains 40.0 mg of saccharin (C₇H₅NO₃S).  Given that saccharin has a molar mass of 183.18 g/mol, how many saccharin molecules are in a 40.0 mg (0.0400g) sample of saccharin? How many carbon atoms are in the same sample?

Que 7. How many C₄H₁₀ molecules are contained in 9.213 g of this compound? How many hydrogen atoms?

Que 8. What is the mass of 0.443 mol of hydrazine, N₂H₄?

Que 9. How many moles of sucrose, C₁₂H₂₂O₁₁, are in a 25g sample of sucrose?

Que10. A prospector panning for gold in a river collects 15.00 g of pure gold. How many Au atoms are in this quantity of gold?