Question

8 In a reaction A + B2→AB2 Identify the limiting reagent, if any, in the following reaction mixtures.
i. 300 atoms of A + 200 molecules of B
ii. 2 mol A + 3 mol B

iii. 100 atoms of A + 100 molecules of B

iv. 5 mol A + 2.5 mol B

v. 2.5 mol A + 5 mol B

9 Calculate the atomic mass (average) of chlorine using the following data:
Isotope % Natural Abundance Molar Mass
35CI 75.77 34.689
37CI 24.23 36.9659

10 In three moles of ethane (C2H6), calculate the following:
i. Number of moles of carbon atoms.

ii. Number of moles of hydrogen atoms.

iii. Number of molecules of ethane.
11 Calculate the amount of water (g) produced by the combustion of 16 g of methane
12 How many moles of methane are required to produce 22 g CO2(g) after combustion?
13 What is the concentration of sugar (C12H22O11) in mol L–1 if its 20 g are dissolved in enough water to make a final volume up to 2L?

14 If the density of methanol is 0.793 kg L–1, what is its volume needed for making 2.5 L of its 0.25 M solution?

15 Calculate the number of atoms in each of the following (i)
1) 52 moles of Ar;

ii.) 52 u of He;

iii.) 52 g of He;

16. What is the molarity of a solution containing 5.035 grams of FeCl3 in enough water to make 500 mL of solution?
17 What is the molarity of a solution containing 72.06 grams of BaCl2 in enough water to make 800 mL of solution?
18 What is the volume of a 0.1 M HCl solution containing 1.46 grams of HCl?

19 MCQ: Unit of Molarity 1.mole/liter 2. Mole/m^3 3.mole/cm^ 4.mole/dm^3

Answer 1

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