1 obliczamy gęstość podanej substancji :
m = 200 g
V = 5 cm³
d = ?
[tex]d = \frac{m}{V } [/tex]
[tex]d = \frac{200 g }{5 cm^3} = 40 \frac{g}{cm^3} [/tex]
2.
d = 40 g/cm³
m = 400 g
V = ?
[tex]d = \frac{m}{V } .............\ \textgreater \ V = \frac{m}{d} [/tex]
[tex]V = \frac{400 g}{40 \frac{g}{cm^3} } = 10 cm^3[/tex]
3.
d = 40 g/cm^3
V = 20 cm³
m = ?
[tex]d = \frac{m}{V } ................\ \textgreater \ m = d * V [/tex]
[tex]m = 40 \frac{g}{cm^3 } * 20 cm^3= 800 g[/tex]
