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10 April, 15:45

If the number of particles in a mole is 6.022x1023, what is the total mass of 1.81*1024 particles of nitrogen gas (N2) ?

A. 42 g

B. 4.2 g

C. 84 g

D. 8.4 g

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Answers (1)
  1. 10 April, 15:59
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    the total mass of 1.81 x10^24 particle nitrogen gas is calculated as follows

    find the moles of nitrogen

    1 moles = 6.022 x10 ^23 particles

    what about 1.81 x10^23 = ? moles

    = (1.81 x10^ 24) / (6.022 x10^23) = 3 moles

    mass = moles x molar mass of nitrogen gas = 14 x2 = 28 g/mol

    = 3 moles x28 g/mol = 84 grams
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