Calculate each of the following quantities. (a) mass in kilograms of 1.6 1020 mo

Question

Calculate each of the following quantities.

(a) mass in kilograms of 1.6 1020 molecules of NO2
check your answer for the correct number of significant figures.
______ kg

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(b) moles of Cl atoms in 0.0330 g C2H4Cl2
check your answer for the correct number of significant figures.
________ mol

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(c) number of H - ions in 5.11 g SrH2
check your answer for the correct number of significant figures.

______ions

Explanation / Answer

a) 6.023*10^23 molecules of NO2 ........ 46*10^-3 kg
    1.6*10^20 molecules of NO2 ............?
     = 12*10^-6 Kg

b) 98 gm of C2H4Cl2 ............ 2 moles of Cl atoms
   0.0330 gm C2H4Cl2 ..............?
     = 0.000673 moles

c) 89.63 gm of SrH2 is having 2*6.023*10^23 H ions
5.11 gm of SrH2 ..............?
= 6.86*10^22 H ions

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