Density is the mass of substance per unit volume of a substance. to solve the problem, first calculate the mass of the gas.
mass gas = ( mass of balloon with gas ) - ( mass of balloon )
mass gas = 10.24 g - 2.42 g
mass gas = 7.82 g
so the density
density = m / v = 7.82 g / 5470 cm3
density = 0.00145 g / cm3
Explanation:
Z is the atomic number, which tells you the number of protons in the element and also its identity. A is the mass number, which tells you the number of protons plus the number of neutrons. X is the chemical symbol of the element, and it must correspond to the atomic number.
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