This assumption is not valid because, there are some elements which exist in two or more forms; they have the same atomic number but differ in their mass number, which meas that they possess different number of neutrons. These type of element are called isotopes. Isotope have the same atomic number and similar physical and chemical properties but they have different number of neutrons and therefore possess different masses.
The density of He is 1.79 x 10⁻⁴ g/mL In other words in 1 mL there's 1.79 x 10⁻⁴ g of He. To fill a volume of 6.3 L the mass of He required = 1.79 x 10⁻⁴ g/mL * 6300 mL = 11 277 * 10⁻⁴ g Therefore mass of He required = 1.1277 g of He
