The Onlinechem Teacher TZ

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25/05/2020

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K A R I B U S A N A

25/05/2020

Form III.
Topic:

QUESTIONS:
Answer all questions
Use:
RAMs (Na= 23 amu; H= 1; O= 16; N= 14; S= 32)
L = 6.022 x 10^23

1. a. What does the term `mole` mean?b. How Avogadro's constant is obtained?

2. a. (i) Why chemists use mole as the unit of measurement?
(ii) mention seven (7) fundamental unit of measurements

3. a. What do you understand by the term 'representative particles'?b. How many particles are in the following amount of substance?
(i) 4 moles
(ii) 0. 035 moles
(iii) 0. 2 moles
(iv) 0. 001 moles
(v) 0. 04 moles

4. Find the number of moles to th material which contain the following number of particles.
a. 225
b. 238 x 10^12
c. 0.1520 x 10^20
d. 9.6345 x 10^5
e. 75369