Based on the mole ratios, what can most likely be predicted?

Question

Accepted Answer

Welcome back everyone. Which of the statements below provides the best explanation for the importance of mole ratios in stoch geometric calculations. Choice A states that they help determine the chemical formula of a compound choice B states that they help to predict the physical state of a compound choice C states that these ratios help determine the amounts of reactant in a product in a chemical reaction. And choice C states that mole ratios help to predict the temperature change during a reaction. Let's begin by recalling that a mole ratio is defined by the moles of a certain substance will say a in proportion to the moles of a second substance which we say is B in this case, recall that we can ensure we have a accurate mole ratio which is going to be sourced from a balanced chemical equation. So if we were to try to figure out the mass of a reactant, we'll say our reactant is A that is needed to form a product will say B we can utilize a mole ratio in order to accomplish this. So say we were given a certain amount of grams of our product B, we would be able to utilize sto geometry where we would utilize the molar mass of our substance B based on its chemical formula. Where recall that molar mass is in terms of grams per mole. So we have grams in our denominator and moles in the numerator, we, we would have grams of B and moles of B. So multiplying by this conversion factor is the use of sto geometry in which we're going to then take the next step by multiplying by a second conversion factor, which is where we're going to implement a mole ratio between moles of our product B to get to moles of our reactant A. So this is where we determine a molar ratio from our balanced chemical equation just making more room. Again, we want to get to the mass of our reactant A. So a final and third conversion factor to multiply by would go from moles of A in the denominator to grams of A in the numerator for the mass of the reactant A required to form product B. And the second conversion or this third conversion factor is the same as our first conversion factor just with regard to reactant A and as a molar mass as a whole. But ultimately, the connecting point between our molar mass of our product and our reactant is the molar ratio where we go from moles of our product to moles of our reactant using the balanced chemical equation coefficients. So looking at our answer choices based on what we've outlined, we're going to rule out choice D because molar ratios do not have anything to do with temperature change predictions. We can also rule out choice B because A molar ratio is not going to predict the physical state of our compounds. And we can also rule out choice A because we will not use molar ratios to determine the chemical formula of a compound. We will use them again to determine amounts of products or reactants in a chemical reaction. And that leaves us with choice C which outlines that exact fact as our final answer to complete this example. So this is the best statement that provides an explanation for the importance of mole ratios and stoch meric calculations where mole ratios help to determine the amounts of reactant and product in a chemical reaction. I hope that this made sense and let us know if you have any questions.

Struggling with General Chemistry?

Based on the mole ratios, what can most likely be predicted?

Watch next

Stoichiometry practice set