How many atoms are in 22.5g of pentane

mass of pentane = 22.5g

molar mass of pentane(C5H12) = 5 x 12.01 + 12 x 1.008

                                                     = 60.05 + 12.096

                                                     = 72.146g/mol

                                                     = 72.15g/mol

22.5g pentane x 1 mol pentane  x  6.022 x 10^23 molecules ofpentane

                            72.15g pentane             1 mol pentane

= 22.5 x 6.022 x 10^23

            72.15

= 1.88 x 10^23 pentane molecules

1 pentane molecule has 5 C + 12 H atoms = 5+12 = 17 atoms

Hence;

1.88 x 10^23 pentane molecules x    17 atoms                      

                                                              1 pentane molecule

= 31.925 x 10^23 atoms

=   3.2 x 10^22 atoms are present in 22.5g of pentane.

3.2 x 10^22 atoms

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.

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