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1)what mass of aluminum bromide would be produced if 2.7g of aluminum was reacted with excess bromine?
2Al+3Br2--->2ALBr3

2)What mass of sodium hydroxide must be reacted with sulfuric acid to produce 14.2g of sodium sulfuric crystals
2NaOH+H2SO4----->Na2SO4+H2O
2. (Original post by molliedyson)

1)what mass of aluminum bromide would be produced if 2.7g of aluminum was reacted with excess bromine?
2Al+3Br2--->2ALBr3

2)What mass of sodium hydroxide must be reacted with sulfuric acid to produce 14.2g of sodium sulfuric crystals
2NaOH+H2SO4----->Na2SO4+H2O
We already know how to do this, the purpose is for you to learn
Let me get you started though:
2.7 grams of Al, is how many moles? How does this correspond to the number of moles of Bromine?
3. (Original post by joostan)
We already know how to do this, the purpose is for you to learn
Let me get you started though:
2.7 grams of Al, is how many moles? How does this correspond to the number of moles of Bromine?
I honestly don't know I've had a trainee teacher for chemistry (Which is so stupid as my exam is in a month) and I have learnt near to nothing, could you explain how I work out these kind of questions please?
4. (Original post by molliedyson)
I honestly don't know I've had a trainee teacher for chemistry (Which is so stupid as my exam is in a month) and I have learnt near to nothing, could you explain how I work out these kind of questions please?
OK, I'll take you through the first one, you can do the second.
How many moles of Al are there?
Hint:
Spoiler:
Show
5. (Original post by joostan)
OK, I'll take you through the first one, you can do the second.
How many moles of Al are there?
Hint:
Spoiler:
Show
2.7/27=0.1 ?
6. (Original post by molliedyson)
2.7/27=0.1 ?
Correct
Now, look at the original equation. How many moles of Br are there in relation to the Al?
Spoiler:
Show
For the avoidance of doubt it's the big number that define moles
7. (Original post by joostan)
Correct
Now, look at the original equation. How many moles of Br are there in relation to the Al?
Spoiler:
Show
For the avoidance of doubt it's the big number that define moles
ahh slightly confused, how to I work out how many moles in Br when there's no mass to divide the atomic number by..or am i dividing it by 2.7 also? sorry chemistry is by far my weakest subject
8. (Original post by molliedyson)
ahh slightly confused, how to I work out how many moles in Br when there's no mass to divide the atomic number by..or am i dividing it by 2.7 also? sorry chemistry is by far my weakest subject
Yes, that's why I said to look at the original equation.
2Al + 3Br2 --> 2AlBr3
9. (Original post by joostan)
Yes, that's why I said to look at the original equation.
2Al + 3Br2 --> 2AlBr3
so 2.7/80=0.03375? I have a feeling I'm doing this all wrong though
10. (Original post by molliedyson)
so 2.7/80=0.03375? I have a feeling I'm doing this all wrong though
No . . . The equation has two moles of aluminium yes?
And 3 moles of Br. Given that you know how many moles of Al there are, how would you find the number of moles of Br from this fact?

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