Question

anyone good in chemistry?

Answer 1

i am a lil depends on wat it is

Answer 2

How many grams of Br2 are needed to react completely with 19.6 grams of Al?

Al + Br2 AlBr3

Be sure to balance the equation.

38.7 grams

43.6 grams

87.1 grams

174 grams

Answer 3

or this one?
When 36 grams of aluminum carbide react with an excess of water, as shown in the unbalanced chemical equation below, how many moles of aluminum hydroxide will be produced?

Al4C3 + H2O Al(OH)3 + CH4

0.25 moles

0.50 moles

1.0 moles

2.0 moles

Answer 4

do u kno how to balance the equation?

Answer 5

yes i dont get how to get the amount needed

Answer 6

ohk this is a mass mass problem hold on let me refresh my memory

Answer 7

im looking at the first one

Answer 8

okay :)

Answer 9

u have 3 steps
1.change grams to moles
2.do mole mole calculations
3.change answer to grams

Answer 10

First find the moles of Al and use mole ratio from the balanced equation to find the moles of Br2.
The moles of Al should be (mass/mw) 19.6g/26.98=0.726moles .
From the mole ratio 2Al:3Br2. therfore you have 1.089moles of Br2. Then find the mass of Br (moles*mw) 1.089*(79.904*2)=174g .hope this helps ..:)

Answer 11

it helps to write the balenced equation and then write wat u have and wat ur looking for

Answer 12

thank you that was a really good explanation