Of the objects below, is the most dense. of the objects below, is the most dense.
a.) an object with a volume of 13 dm3 and a mass of 1.29 × 103 g
b.) an object with a volume of 3.91 × 10-24 nm3 and a mass of 7.93 × 10-1 ng
c.) an object with a volume of 2.5 l and a mass of 12.5 kg an object with a volume of 0.00212 m3 and a mass of 4.22 × 104 mg
d.) an object with a volume of 139 ml and a mass of 93 g

The correct answer is option B.
n object with a volume of 3.91 × 10-24 nm3 and a mass of 7.93 × 10-1 ng is the most dense.
Density is the mass per unit volume. In all the options mass and volume are given but in different units, first convert volume into L, cm3 or ml and mass to g or kg and then we can calculate the density by using the formula:
Density = Mass / Volume

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.