# chemistry

calculate the number of gram of Al2S3 which can be prepared by the reaction of 20 gram of Al and 30 gram of sulpher . how much the non limiting reactant is in excess?

1. 👍 0
2. 👎 0
3. 👁 476
1. The following will solve any "single" stoichiometry problem yu have. I work the limiting reagent problems two times, once with each reagent.
http://www.jiskha.com/science/chemistry/stoichiometry.html
Use 30 g S and all the Al you need; solve for moles Al2S3. Then use 20 g Al and all the S needed and solve for moles Al2S3. Both answers can't be right; the correct answer in limiting reagent problems is ALWAYS the smaller one. Take that and convert to moles.
To find how much of the other reagent is in excess just do another stoiochiometry problem.

1. 👍 0
2. 👎 0
posted by DrBob222
2. 20g of Al = 20/26.98 mol = 0.74 mol
30g of S = 30/32.07 mol = 0.94 mol

so, only min(.74/2,.94/3) = 0.31333 mol of Al2S3 can be formed:

.31333 mol Al2S3 = .61667*26.98g Al + .94*32.07 g S = 16.64g Al + 30g S

That leaves 3.36g Al unreacted.

1. 👍 0
2. 👎 0
posted by Steve
3. 40.87

1. 👍 0
2. 👎 0
4. It gives 'Limiting Reactant' relationship.

1. 👍 0
2. 👎 0
5. sahi nai likha hua

1. 👍 0
2. 👎 0
6. sahi nai likha hua
plz clear tariqy sy likha hona chahiya

1. 👍 0
2. 👎 0
7. Yar ache tarhan explain to kro samjh ni ai

1. 👍 0
2. 👎 0
8. Samajh nhi aiiii

1. 👍 0
2. 👎 0
posted by Sana...

## Similar Questions

1. ### Chemistry

Al+S=Al2S3 Balanced equ= 2Al+3S=Al2S3 10 grams of Al were mixed with 15 gram of S Find: limiting reagent al or s? How much Al2S3 were formed in reaction? What is the excess reagent?Al or S? How much excuss reagent left over after

asked by malina on November 20, 2012
2. ### chemistry

calculate the number of grams of Al2S3 which can be prepared by the reaction of 20g of Al and 30gm of sulphur. how much the non_limiting reactant in excess?

asked by Ahsan on May 6, 2016
3. ### Chemistry

Al_S=Al2S3 10 grams of Al were mixed with 15 gram of S Find: limiting reagent al or s? How much Al2S3 were formed in reaction? What is the excess reagent?Al or S? How much excuss reagent left over after reactin? Thanks!

asked by mal on November 20, 2012
4. ### Chemistry

Based on the balanced equation Al2S3 + 6H2O → 2Al(OH)3 + 3H2S calculate the number of excess reagent units remaining when 4 Al2S3 formula units and 30 H2O molecules react? Molar Mass (g/mol) Al2S3 150.16 H2O 18.015 Al(OH)3

asked by SIMON on February 20, 2009
5. ### Chemistry

if the yieeld for the following reaction is 85% how many grams of Al2S3 should be used to produce 165 g of Al(OH)3? Al2S3+6H2O-->2Al(OH)3+3H2S

asked by annabel on May 16, 2012
6. ### Chemistry

If 48.1 g of solid Al2S3 and 6.68 mL of liquid H2O are reacted stoichiometrically according to the balanced equation, how many grams of solid Al2S3 remain? Al2S3(s) + 6H2O(l) → 2Al(OH)3(s) + 3H2S(g) I found that the limiting

asked by Judy on June 4, 2010
7. ### Chemistry

Following question I need help with part b) Please verify my answer for part a) too if possible. Consider the following reaction for silver tarnishing: 3Ag2S(s) + 2Al(s) -> 6Ag(s) + Al2S3(s) a. State the oxidation number for each

asked by Dexter on June 14, 2011
8. ### Chemistry

Determine the # of moles of Al2S3 that can be prepared by the reaction of 0.400 moles of Aluminum with 0.700 moles of Sulfur, and Also find the # of moles of reactant in excess

asked by Denise on May 7, 2011
9. ### chemistry

If 48.1 g of solid Al2S3 and 6.68 mL of liquid H2O are reacted stoichiometrically according to the balanced equation, how many grams of solid Al2S3 remain? Al2S3(s) + 6H2O(l) ¡æ 2Al(OH)3(s) + 3H2S(g) Molar Mass (g/mol) Al2S3

asked by Judy on June 2, 2010
10. ### chemistry

Is this equation correctly balanced? If not why. Al2S3+H2O----> Al2S3+3H2O---->Al2(SO)3+3H2

asked by What? on October 22, 2012

More Similar Questions