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Atomic Mass and Atomic Mass Unit

What is the m...

Question

What is the mass of: [3 MARKS]

1. 0.2 mole of elemental oxygen atom
2. 0.5 mole of water molecules
3. 2 mole of cabon dioxide

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Solution

Each point: 1 Mark

1. Mass of one mole of elemental oxygen atom = 16 g
Then, mass of 0.2 mole of oxygen atoms = 0.2 x 16g = 3.2 g

2. Mass of one mole of water molecule = (2 x 1 g)+ 16 g =18 g
Then, mass of 0.5 mole of water molecules = 0.5 x 18 g = 9 g
3. Mass of one mole of carbon dioxide molecule = 12 g + (2 x 16 g) = 44 g
Then, mass of two mole of carbon dioxide molecule = 2 x 44 g = 88 g

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Similar questions

Q. Calculate the mass of:
(a) 0.2 mole of the elemental oxygen atoms
(b) 0.5 mole of water molecules

Q. Fill in the following blanks :
(a) 1 mole contains ...................... atoms, molecules or ions of a substance.
(b) A mole represents an ..................... number of particles of a substance.
(c) 60 g of carbon element are ................... moles of carbon atoms.
(d) 0.5 mole of calcium element has a mass of ......................
(e) 64 g of oxygen gas contains ....................... moles of oxygen atoms.

A) 1.5 Moles of $B a C O_{3}$	1) 3 moles of oxygen atoms
B) 2 moles of $H_{2} S O_{4}$	2) 7.5 moles of oxygen atoms
C) 2.5 moles of $Z n C O_{3}$	3) 8 moles of oxygen atoms
D) 0.5 mole of $G l u c o s e$	4) 4.5 moles of oxygen atoms

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