Ask Remember Me?

# Chemistry homework

Asked May 29, 2009, 08:40 PM — 3 Answers
Find the mass of AlCl3 that is produced when 510 grams of Al2O3 react with HCl according to the following equation: Al2O3+6HCl=2AlCl3+3H2O .

3 Answers
 nserant Posts: 9, Reputation: 1 New Member #2 May 29, 2009, 08:40 PM
Find the mass of AlCl3 that is produced when 510 grams of Al2O3 react with HCl according to the following equation: Al2O3+6HCl=2AlCl3+3H2O .
 Perito Posts: 3,141, Reputation: 781 Ultra Member #3 May 30, 2009, 05:33 AM
Quote:
 Originally Posted by nserant Find the mass of AlCl3 that is produced when 510 grams of Al2O3 react with HCl according to the following equation: Al2O3+6HCl=2AlCl3+3H2O .
You are already given a balanced chemical equation. That would be the first step if you didn't know it:

$Al_2O_3+6HCl=2AlCl_3+3H_2O$

You have 510 grams of $Al_2O_3$. In the chemical world, we deal in moles when doing this type of calculation. To convert from moles to grams or vice-versa, we need the molecular weight of $Al_2O_3$

Molecular Weight Al2O3 = 2 * atomic weight of Al + 3 * Atomic Weight of O

Molecular Weight Al2O3 ≈ 2 * 27 + 3 * 16 = 102 g/mole.

Given 510 grams, how many moles of Al2O3 do we have?

$510\,g \times \frac {1\,mole}{102\,g} =5\,moles$

From the balanced chemical equation, we can see that 2 moles of AlCl3 are produced for every mole of Al2O3 that reacts. Therefore, we'll produce 2 x 5 = 10 moles of AlCl3.

Molecular Weight AlCl3 = 1 * atomic weight of Al + 3 * atomic weight of Cl

Molecular Weight AlCl3 = 27 + 3 * 35.5 = 133.5 g/mole

Since 10 moles of AlCl3 are produced, we can calculate the weight

$10\,moles\,AlCl_3 \times \frac {133.5\,g}{mole} = 1335\,g\,AlCl_3$
 Unknown008 Posts: 8,147, Reputation: 3745 Uber Member #4 May 30, 2009, 05:44 AM
Was going to answer... Great post Perito, had to spread the rep though... Nice avy! Jerry's got a new friend now

Not your question?

 Thread Tools Search this Thread Search this Thread: Advanced Search

## Check out some similar questions!

Chemistry Homework Help [ 1 Answers ]

Hello Im having trouble answering these two questions for my chemistry review. Any help would be greatly appreciated. (1) Which of the following accounts for the fact that Boyle's Law predicts volumes that are smaller than those observed experimentally at high pressures? A) Gas molecules...

Chemistry homework [ 4 Answers ]

Which set of chemical name and chemical formula for the same compound is correct? Choose from these 1.Iron(11) oxide, Fe2O3 2.aluminum fluorate, AlF3 3.tin(IV) bromide, SnBr4 4.potassium chloride, K2Cl2

Chemistry homework. [ 1 Answers ]

Ok here is the question: Write each of the following numbers using scientific notation: A) 1.02 thousand B) 0.07102 C) 3050 D) 1.51 million E) three thousand F) 31.05 Please help its urgent.. Thanks a lot.

Chemistry homework [ 1 Answers ]

Question: You have two chemicals which are A and B and both are solid. You don't know the exact composition of either one of them. You do know that all together, there is some combination of sodium, barium, chloride, and phosphate present. You dissolve both chemicals in water and then mix A and B...