Question

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Answer 1

Answer:

9.96 × 1020 molecules of N2O

Explanation:

Molar mass of N2O = 44 g

Number of moles of N2O in 44 g = 1

Number of moles of N2O in 1g of N2O = 1 / 44

Number of moles of N2O in 200 mg or 200 × 10-3 g of N2O = 200 × 10-3 / 44 =  4.545 × 10-3 moles

 

Number of moles of N2O left = 2.89 × 10-3 moles……(Given)

Total Number of moles of N2O = 4.545 × 10-3 moles

Number of moles removed of N2O = 4.545 × 10-3 – 2.89 × 10-3 = 1.655 × 10-3 moles

 

1 mole of N2O = 6.022 × 1023 molecules of N2O

1.655 × 10-3 moles of N2O = 1.655 × 10-3 ×  6.022 × 1023 molecules of N2O  = 9.96 × 1020 molecules of N2O