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Chemistry
3. Atoms and Molecules
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Q35 of 49 Page 22

Express each of the following in kilograms

(a) 5.84×10-3 mg


(b) 58.34 g


(c) 0.584g


(d) 5.873×10-21g

(a) 5.84×10-3 mg = 5.84×10-9 kg

(b) 58.34 g = 5.834 x 10-2 kg


(c) 0.584g = 5.84 x 10-4 kg


(d) 5.873×10-21g = (d) 5.873×10-24 kg


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33

The visible universe is estimated to contain 1022 stars. How many moles of stars are present in the visible universe?

34

What is the SI prefix for each of the following multiples and submultiples of a unit?

(a) 103


(b) 10–1


(c) 10–2


(d) 10–6


(e) 10–9


(f) 10–12

36

Compute the difference in masses of 103 moles each of magnesium atoms and magnesium ions.

(Mass of an electron = 9.1×10–31 kg)

37

Which has more number of atoms?

100g of N2 or 100 g of NH3?

Questions · 49
3. Atoms and Molecules
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