Calculate the mass of a gas with a density of 0.0065 g/cm3 and volume of 260 cm3

If there are 260 cm³ of this substance, and each cm³
holds  0.0065 grams of mass, then the total mass of
the sample is
                             (260 cm³) x (0.0065 g/cm³)

                          = (260 x 0.0065) grams

                          =               1.69 grams .
                                           (0.00169 kg)