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pv=nRT Ideal gas chemistry question ?

Assuming a volume of hydrogen of 65ml, a final gas temperature of 25 degrees C, and a gas pressure of approximately 720 torr, calculate the appropriate amount of aluminum, in grams, to be reacted. Be sure to include a balanced chemical equation for the reaction of Aluminum eith HCl to produce hydrogen gas.

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

V = 0.065 L
T = 298 K
p = 720/760= 0.947 atm

moles H2 = pV/RT = 0.947 x 0.065 / 0.0821 x 298 = 0.00252

moles Al = 0.00252 x 2 / 3 =0.00168

mass Al = 0.00168 mol x 26.9815 g/mol= 0.0453 g

Behaviour Of Perfect Gas And Kinetic Theory

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