Question

Homework 3 t Gas Density and Molar Mass 6 of 14 > ReviewI Constants Periodic Table ▼ Part B Pressure and temperature affect the amount of space between gas molecules, which affects the volume and, therefore, the density of the gas since To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 4.5-L bulb, then filled it with the gas at 1.30 atm and 24.0 °C and weighed it again. The difference in mass was 6.7 g. Identify the gas density- volume The molar mass of a substance, however, is a constant and can be used to identify an unknown gas sample. Molar mass is found by dividing the mass of a sample (in grams) by the number of moles in that sample. The number of moles of gas can be calculated using the ideal gas law Express your answer as a chemical formula. View Available Hint(s) which can be rearranged as RT Given the number of moles of a gas and its molar mass, you can calculate the mass of the gas. Since density is equal to the ratio of the mass and Submit

Answer 1

Total pressure of the gas, ta788 mmHg The vapor pressure of water, 23.8 mmHg Pressure of dry gas, Paye eda toal ater 788 mmHg - 23.8 mmHg = 764.2 mmHg Equation: Zn + 2HCI> ZnCl, + H2 PV No of moles of H2 produced, n RT (764.2 mmHg (0.901 L) 624 Lrmo g)(25°C+273)K LmmHg K.mol 0.0370 mol 1 mol Zn 65.4 g 1mol H2 1mol Zn No of moles of Zn reacted = 0.0370 mol H2 × = 2.422 g mass of zinc mass percentage of zinc- x 100% mass ot penny 2.4228,x 100% 2.483 g -975% 98%