Calculate the total number of atoms contained in each case

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Calculate the total number of atoms contained in each case.a) 0.12 mole of aluminium chloride, AlCl3

b) 6.46 g of germanium (IV) chloride, GeCl₄

c) 9.90 L of nitrogen (IV) oxide, NO₂, at NTP conditions

 

d)   5.4 x 10³ L of gaseous ethane, C₂H₆, at -10 °C and 1.2 x 10² kPa.