pv questions
Chemistry question? PV=nRT?
2 Al + 6 HCl ===> 2 AlCl3 + 3H2
Calculate the volume, in liters, of hydrogen gas produced at 25C and 850 mmHg, from the reaction of 14.5g of aluminum with excess hydrochloric acid. (remember that at STP, one mole of gas occupies a volume of 22.4L.)
Okay so far ive gotten that you have to use PV=nRT but I dont know if you have to use the universal constant or what. Ive tried to work it out but i just get myself confused. Any help will be appreciated!! thanks!!
The answer would be 17.6 L.
Step 1: First, you must calculate how many moles of H2 will be produced if 14.5g of aluminum is reacted. You do this by first converting 14.5g of Al into moles of Al by dividing 14.5 by 26.98. (1 mol Al = 26.98 g).
Step 2: To calculate the moles of H2 that will be produced, multiply the number you found in step 1 by 3/2, (or 1.5) since for every 3 moles of H2 produced, 2 moles of Aluminum are reacted. ( You can see this from the balanced equation.)
Step 3: Now to calculate the volume of H2, you may use the ideal gas equation PV=nRT, in which P stands for pressure, V stands for volume, n stands for the number of moles, R stands for the universal gas constant (which is 0.0821 L/Atm per mol/Kelvin), and T stands for temperature.
a) Be sure you convert the given pressure into atm by dividing 850 by 760. (760 mmHg is equal to 1 atm)
b) Also make sure you convert the temperature in celsius to kelvin by adding 273 to 25.
c) Now all you have to do is solve for the volume. Multiply the moles of H2 you found in Step 2 by 0.0821 and then muliply that number by temeprature in kelvin you found in step 3b. Finally, divide this answer by the pressure you calculated in step 2a. This final answer represents the volume in liters of H2.
If you did all the steps and calculations correctly, your answer should be close to 17.6 L.
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