Consider equation 3A+B=C+D. You react 4 moles of A with 2 moles of B. Which of the following is true?
1) L.R. is one with higher molar mass
2) A is L.R. because you need 6 moles of A and have only 4 moles
3) B is L.R. because you have fewer moles of B than A
4) B is L.R. because 3A molecules react with each B molecule
5) Neither reactant is limiting
I don't know what ELAC means, but if you want an expert to help you with this question, you should use your school subject in the appropriate box.
I have no idea what ELAC stands for. I clicked on this just because you had no subject. The SUBJECT goes here.
Second question. Does L. R. stand for limiting reagent. For us old folks, you should use words and not initials or ABB ;-).
I rank this a a poor question. 1 CAN be true if the molar masses are right but 2 is the correct answer.
To determine which reactant is the limiting reagent, we need to compare the moles of each reactant to the stoichiometric ratio provided by the balanced equation.
From the equation 3A + B = C + D, we see that 3 moles of A react with 1 mole of B.
Given that you have 4 moles of A and 2 moles of B:
1. To compare the molar masses of A and B is not a valid method for determining the limiting reagent. The molar mass is irrelevant in this case.
2. To determine if A is the limiting reagent, we calculate the moles of C and D that can be produced based on the given amount of A:
4 moles of A * (1 mole of C + 1 mole of D) / 3 moles of A = (4/3) moles of C and D
As a result, 6 moles of C and D are required, but we can only produce (4/3) moles. Therefore, A is not the limiting reagent.
3. To determine if B is the limiting reagent, we calculate the moles of C and D that can be produced based on the given amount of B:
2 moles of B * (3 moles of C + 3 moles of D) / 1 mole of B = 6 moles of C and D
As a result, we can produce exactly 6 moles of C and D with the given amount of B. Therefore, B is not the limiting reagent.
4. To state that B is the limiting reagent because 3 molecules of A react with each molecule of B is not accurate. We need to consider the stoichiometric ratio in terms of moles, not molecules.
5. Since neither A nor B is the limiting reagent, the correct answer is option 5) Neither reactant is limiting. This implies that you have an excess amount of both reactants, and the limiting reagent is something else not mentioned in the given information.