Calculate the masses of (i) 2.00 gram atoms of chlorine (ii) 2.00 gram molecules of chlorine (iii) 10.50 gram molecules of ammonia.

Calculate the masses of (i) 2.00 gram atoms of chlorine (ii) 2.00 gr

1.	Calculate the masses of (i) 2.00 gram atoms of chlorine (ii) 2.00 gram molecules of chlorine (iii) 10.50 gram molecules of ammonia.
Answer» Solution : (i) `therefore`The ATOMIC MASS of chlorine (CI) = 35.45 amu `therefore`The gram atomic mass of chlorine = 35.45 g Since, mass in grams = Number of gram atoms x gram atomic mass We have, mass of chlorine = `2.00 xx 35.45 = 70.9` g (ii) `therefore` The molecular mass of chlorine `(Cl_(2))` `therefore` The gram molecular mass of `Cl_(2) = 70.9 g` Since, mass in grams = Number of gram molecules `xx` gram molecular mass We have, mass of chlorine = `2.00 xx 70.9 = 1.42 xx 10^(2)`g (iii) The molecular mass of ammonia `(NH_(3))` `=14.01 + (3 xx 1.008) = 17.034 amu` = 14.01 + (3 x 1.008) = 17.034 amu The gram molecular mass of `NH_3= 17.034` g Hence, we have mass of `NH_(3) = 10.50 xx 17.034 = 178.8` g