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Chemistry
3. Atoms and Molecules
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Q31 of 75 Page 81

Calculate the mass of each of the following:

7 moles of sulphuric acid

Given: Number of moles = 7


Atomic mass of H2SO4 = 2 ×1 + 32 + 4 × 16 = 98g/mol


To find out the mass of sulphuric acid, apply the formula given:



⇒


⇒ Mass = 7 mol × 98g/mol


⇒ Mass = 686g


Thus, the mass of sulphuric acid is 686g.


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31

Calculate the mass of each of the following:

10 moles of hydrogen cyanide

31

Calculate the mass of each of the following:

2 moles of methane

32

Name a greenhouse gas with molar mass 44 g mol–1 and is known to extinguish fire.

[Given, atomic masses of C = 12 u, O = 16 u, NA = 6.022 × 1023 per mole]

32

Name the elements present in this gas and wire their valency.

[Given, atomic masses of C = 12 u, O = 16 u, NA = 6.022 × 1023 per mole]

Questions · 75
3. Atoms and Molecules
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