chem 2.docx

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RheymarkbutronRamada

chemistry for engineers

Assessment 2
Problem
1. Calculate the molecular mass for the following
a) Sulphuric acid (𝐻2𝑆𝑂4)
b) Water (𝐻2𝑂)
c) Carbon dioxide (𝐶𝑂2)
d) Sodium carbonate (𝑁𝑎2𝐶𝑂3)
2. How many moles are present in
a) 220 g of carbon-dioxide
b) 72 g of water
c) 196 g of sulphuric acid
d) 3 moles of ammonia
e) 2.5 moles of sulphuric acid
f) 1.5 moles of carbon dioxide
3. How many molecules are present in the following?
a) 4g of nitrogen
b) 16g of oxygen
c) 32g of methane
4. What is the mass of the following
a) One molecule of 𝐶𝑂2
b) One molecule of 𝐻2𝑂
5. Which one is heavier in the following at STP?
a) 3 moles of 𝐻2𝑂 (𝑂𝑅) 1 mole of 𝐻2𝑆𝑂4
Questions
PART-A
1. Define molecule

2. Define molecular mass of a substance
3. Define mole
4. What is molecular formula?
PART-B
1. State Avogadro’s hypothesis
PART-C
1. What are the applications of Avogadro’s hypothesis?

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chem 2.docx

1. Assessment 2 Problem 1. Calculate the molecular mass for the following a) Sulphuric acid (𝐻2𝑆𝑂4) b) Water (𝐻2𝑂) c) Carbon dioxide (𝐶𝑂2) d) Sodium carbonate (𝑁𝑎2𝐶𝑂3) 2. How many moles are present in a) 220 g of carbon-dioxide b) 72 g of water c) 196 g of sulphuric acid d) 3 moles of ammonia e) 2.5 moles of sulphuric acid f) 1.5 moles of carbon dioxide 3. How many molecules are present in the following? a) 4g of nitrogen b) 16g of oxygen c) 32g of methane 4. What is the mass of the following a) One molecule of 𝐶𝑂2 b) One molecule of 𝐻2𝑂 5. Which one is heavier in the following at STP? a) 3 moles of 𝐻2𝑂 (𝑂𝑅) 1 mole of 𝐻2𝑆𝑂4 Questions PART-A 1. Define molecule

2. 2. Define molecular mass of a substance 3. Define mole 4. What is molecular formula? PART-B 1. State Avogadro’s hypothesis PART-C 1. What are the applications of Avogadro’s hypothesis?