Question

Parts C and D

Use the molar volume to calculate each of the following at STP:

Part C Calculate the volume, in liters, occupied by 36.1 g of Ar gas. Express your answer to three significant figures and include the appropriate units. ? DI PÅ Value M o D Units Submit Request Answer Part D Calculate the number of grams of H2 in 1690 mL of H2 gas. Express your answer to three significant figures and include the appropriate units. T: PÅ O ? | Value Units

Answer 1

Part To find the volume,in liters at STP Given that 36.1 g of Argas First find the moles of Ar gas mass moles molarm ass molarmass of Ar= 39.95g/mol 36.1 g moles 39.95g/mol = 0.904 mol At STP Im ole of any gas occupies 22.4L 1m ole = 22.4L Therefore0.904 mol = 0.904x 22.4L = 20.25L Hence the volume = 20.25L Part D To find the number of grams of H Given that 1690mL of H, gas 1690mL = 1.69L First find the moles of H, gas at STP At STP Imole of any gas occupies 22.4L Imole = 22.4L IL za moles Therefore 1.69L = 1.69x5a moles = 0.0754moles To find the number of grams of H mass = moles Xmolarmass molarmass of H2 = 2.016 g/mol mass = 0.0754 mol x 2.016 g/mol = 0.152g Hence the number of grams of H, = 0.152g