Question

Convert into moles: 1) 12g of oxygen atoms 2) 60 g of calcium 3) 3.011 × 10rise to 23 number of particles

Answer 1

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Answer 2

1)
Given mass = 12 grams
Molar mass of Oxygen = 16 grams

No: of moles = Given mass ÷ Molar mass
                     = 12 ÷ 16
                     = 0.75 moles
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2)
Given mass = 60 grams
Molar mass = 40 grams
No: of moles = Given mass / Molar mass
                     = 60 ÷ 40
                     = 1.5 moles
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3)
Given no:of particles = 3.011 ×10 ²³
No: of moles = Given no:of particles ÷ Avogadro no:
                     = 3.011 ×10 ²³ ÷ 6.022 × 10²³
                    = 0.5 moles
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