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Problem 115

In each pair, choose the larger of the indicated …

11:23
University of Maine
Problem 114

Is each of the following statements true or false? Correct any that are false.
(a) A mole of one substance has the same number of atoms as a mole of any other substance.
(b) The theoretical yield for a reaction is based on the balanced chemical equation.
(c) A limiting-reactant problem is being stated when the available quantity of one of the reactants is given in moles.
(d) The empirical and molecular formulas of a compound are always different.

Answer

a. (T)
b. T
c. False
d. False


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Video Transcript

there are several different ideas about chemical reactions that that can be analysed. Using the following statement is either true or false. The first statement, A says a mole of one substance has the same number of atoms as a mole of any other substance. We know that one more is equal to 6.2 times 10 to the 23rd things. This is called of a God rose number. The particles, however, are the base unit of whatever we're counting. So if, for example, we had a mole of carbon atoms, we would have 6.2 times 10 to the 23rd carbon atoms. If, however, I had a mole of carbon dioxide molecules, this would be 6.2 times 10 to the 23rd molecules. Each molecule is made up of three atoms to oxygen's and three carbons, so this would be equal to three times 6.2 times 10 to the 23rd Adams. So the statement A is false because it should say, rather than having the same number of atoms, the same number of unit particles instead of Adams statement, be talks about the idea of a theoretical yield. The theoretical yield is how much product will form, given a certain amount of reactant. To find the theoretical, you'll we start off with a quantity of a reactant, which we change. Two moles of reactant, which we can then change. Two moles of product, which tells us how much product should form and the way that we convert from moles of reactors. Two. Moles of product is using the mole ratio, which comes from the balanced equation. So this statement is true. Restaurants see talks about the idea of a limiting re agent in a limiting re agent problem. We have two quantities of reactant. Each one will form a certain amount of moles of product. Typically one form smaller amount of the product. This is called the limiting re agent. In order to calculate the limiting re agent friend, you need to know both moles of reactive, not just one. So this statement is false. Not only the last question cox about the difference between empirical and molecular formula for a compound, the empirical formula is the simplest whole number ratio of atoms in a molecule. The molecular formula is the actual ratio, and it's usually a multiple of the empirical formula. So, for example, bending is a molecule that has an empirical formula of C. H. But its actual molecular formula is C six h six. So in this case, the empirical formula and the molecular formula are not the same. However, carbon dioxide has an empirical formula of CEO, too. It's molecular formula is also CEO too. So in this case, it's this things. So the empirical formula and molecular formula are not always the same. So this statement is false, Yeah.

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