(Sorry for the awful quality) 1 atm to kpa Googles X LiveScore Basketball - X We

Question

(Sorry for the awful quality)

1 atm to kpa Googles X LiveScore Basketball - X Western University, Ontax w Washoe (chimpanse ng.ca/ibiscms/mod/ibis/view.php?id=289717 versity, Ontario-CHEM 1302 - Genchem Il-Winter18-DEPT > Activities and Due Dates > Assignment #1 - Gases ® Gradebook O 1/24/2018 09:00 AM OS 62.6/100 0 1/21/2018 02:28 PM Calculator Periodic Table Question 25 ol 40 incorrect X incorrect 32 A Sapling Learning Mup A The reaction of metallic aluminum with aqueous hydrochloric acid produces hydrogen gas. 2Al(s) + 6HClaq) 2AICI,(aq) + 3H,( Hydrogen gas produced by this reaction is typically collected via water displacement during which time the hydrogen gas becomes saturated with water vapor. A 291.3 mL sample of gas with a total pressure 121 kPa was collected via water displacement at 29.4 °C. Calculate the partial pressure of hydrogen gas in the sample. The vapor pressure of water at 294 C is 4,10 kPa. *er at . ar 29.4er vapor. A 20 tad via wa Number 116.9 kPa Calculate the mass of aluminum that reacted to produce this quantity of hydrogen gas. Number 0.2435177928 O Previous Try Age O Next Jem o e s

Explanation / Answer

Given

Pressure of Hydrogen gas = 116.9 kPa = 1.154 atm

volume = 291.3 ml = 0.2913 L

Temperature T = 29.4 C = 302.4 K

R = 0.08206 L.atm/mol.K

PV = nRT

1.154 atm * 0.2913 L = n * 0.08206 L.atm/mol.K * 302.4 K

n = 0.01355 moles of H2

According to reaction stoichometry

2 moles of Al will produce 3 moles of H2

so No. of moles of Al = 0.01355 moles of H2 * 2 /3 = 0.00903 moles of Al

molar mass of Al = 27 g/mol

Mass of Al = 0.00903 moles * 27 g/mol = 0.244 g Answer

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