There are two significant figures.
84 lb = 38101.759 g
84 g = 0.084 kgTo convert from g to kg, divide by 1000.
150 g x 1 mol/68.154 g = 2.2 moles (2 sig figs)
3.65(g) / 65.38(g/mol) = 0.0558 (mol)
449 g K x 1 mole K/39 g K = 11.5 moles (3 sig figs)
84 socks
74.3 g Na2CrO4 x 1 mole/162 g = 0.459 moles (3 sig figs)
5 sig figs
there are 3 sig figs. 4, 0, and 5 are the sig figs
There are four sig figs in 1.032
about 9
There are three sig figs in 4890.