Please do only Second page. i figured out the first LAB 7 DETERM?NATION OFTHE MO

Question

Please do only Second page. i figured out the first

LAB 7 DETERM?NATION OFTHE MOUR VOLUME OFA GAS PRE-LAB QUESTIONS 1. A student did the experiment described exceptshe used Al foil nstead of Mg. Her dat table included the following values. Mass of A Temperature Barometric pressure Volume of H, gas 0.0352 g 19.08 C 762.5 mm Hg 46.92 mL Answer the following questions based on this data table. a. Write the balanced equation for the reaction between Aluminum and hydrochlonc b. How many moles of Al were consumed? c. How many moles of H, were produced? d. What was the vapor pressure of the water in the gas sample?

Explanation / Answer

2 Al + 6 HCl ----> 2 AlCl3 + 3 H2

number of moles of Al = 0.0352/27 = 0.001304 moles

according to ideal gas equation,

PV = nRT

((762.5-16.5)/760) * (46.92/1000) = n * 0.0821 * (19.08+273)

n = 0.00192 moles

Vapour pressure of water = 16.5 mm Hg

pressure of the dry hydrogen = 762.5 - 16.5 = 746.0 mm Hg

STP conditions are p = 1 atm and T = 273 K

according to Ideal gas equation,

1*V = 0.00192 * 0.0821 * 273

V = 0.04303 L

1 * V = 1 * 0.0821 * 273

V = volume of dry hydrogen = 22.41 L

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