Question

19. How many kilograms of Helium are needed to fill a balloon that is 25.0 liters inyolumne? (Density of He is 0.166 g/ml)

Answer 1

4.15 kg

Step-by-step explanation

We have the volume and density and we want to find the mass. The formula for density is:

`\rho=(m)/(V)`

Solving for m:

`m=\rho\cdot V`

First we have to adjust the units. The density is given in g/mL and the volume is given in liters, so we can find the equivalent volume in mL:

`V=25L=25000mL`

Now we replace and find the mass:

`m=0.166(g)/(mL)\cdot25000mL`

The mL gets cancelled and the result is in grams:

`m=4150g`

Which we have to divide by 1000 to find its equivalent in kilograms: