What is the volume of hydrogen gas at STP released at 2.70 g of aluminum H2 (g)

Question

What is the volume of hydrogen gas at STP released at 2.70 g of aluminum

H2 (g) AIC13(aq) HCI (aq) Al(s) A) 1.12 L B) 1.49 L c) 2.24 L D) 3.36 L E) 6.72 L 5) What volume of oxygen gas reacts with 20.0 mL of hydrogen chloride? (Assume temperature and pressure remain constant.) C12(g) H20(g) 02(g) HCI(9) A) 5.00 mL B) 10.0 mL. C) 20.0 mL. D) 40.0 mL. E) none of the above 6) What volume of oxygen gas reacts with 5.00 mL of methane, CH4? (Assume temperature and pressure remain constant.) spark co2 (g) H20(g) CH4(g) 02(g)

Explanation / Answer

Question 1.

First, let us balance the equation

Al(s) + HCl(aq) = AlCl3(aq) + H2(g)

balance Cl

Al(s) + 3HCl(aq) = AlCl3(aq) + H2(g)

balance H

Al(s) + 3HCl(aq) = AlCl3(aq) + 3/2H2(g)

Multiply all by 2

2Al(s) + 6HCl(aq) = 2AlCl3(aq) + 3H2(g)

this is balanced

for...

m = 2.70 g of Al(s)

change to mol

mol = mass/MW = 2.70/26.98153860 = 0.1 mol of Al

this will react according to the ratio

2 mol of Al = 3 mol of H2

0.1 mol of Al = 3/2*0.1 = 0.15 mol of H2

recall that

1 mol of gas at STP = 22.4 L

0.15 mol of gas --> 0.15*22.4 = 3.36 L

best answer is D

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