What mass of an object (density = 12.83 g/L) must be weighed in air if the desired true mass is 7.8297 g? The density of air is 0.0012 g/mL and the density of the calibration weights is 8.0 g/mL.
a) 4.998 g
b) 5.998 g
c) 6.998 g
d) 7.998 g