Explain if possible. if an object has a density of 4.2 g/ml, what is its density in hg/l? 0.0042 hg/l 0.042 hg/l 42 hg/l 4,200 hg/l

            42 hg/L

Solution:

Converting Grams into Hectograms:

                                                         As we know one gram is equal to 0.01 Hectogram. Using this relation we can convert 4.2 g into hg as,

                                                1 g  =  0.01 hg

So,

                                             4.2 g  =  X hg

Solving for X,

                    X  =  (4.2 g × 0.01 hg) ÷ 1 g

                    X  =  0.042 hg

We also know one millilitre (mL) is equal to 0.001 litre (L).

Therefore,

                              Density  =  Mass ÷ Volume

Putting new values,

                              Density  =  0.042 hg ÷ 0.001 L

                              Density  =  42 hg/L

the answer would be c