In each of the following pairs, which has the greater mass? (See Table 1.5.)
a. $1.0 \mathrm{~kg}$ of feathers or $1.0 \mathrm{~kg}$ of lead
b. $1.0 \mathrm{~mL}$ of mercury or $1.0 \mathrm{~mL}$ of water
c. $19.3 \mathrm{~mL}$ of water or $1.00 \mathrm{~mL}$ of gold
d. $75 \mathrm{~mL}$ of copper or $1.0 \mathrm{~L}$ of benzene