Chemistry, 14.10.2019 08:02 dionne83

If 4.0 moles of x and 4.0 moles of y react according to the hypothetical reaction below, how many moles of the excess reactant will be left over at the end of the reaction? 2x + 3y yields x2y3

1.3 mol y left over
2.7 mol y left over
1.3 mol x left over
2.7 mol x left over

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2X + 3Y --> X2Y3

You have initially 4 moles of both X and Y.
2 moles of X and 3 moles of Y are needed to make X2Y3.

4 moles X * (3 moles Y/2 moles X) = 6 moles Y
We do not have 6 moles of y, which means that Y is the limiting reactant.

4 moles Y * (2 moles X/3 moles Y) = 2.667 moles X

We start off with 4 moles of X, and we react 2.667 moles of X.
We start off with 4 moles of Y, and we react all 4 moles of Y. (Remember, this is the limiting reactant.)

The reactant that will be in excess is X, and it will have 4 - 2.667 = 1.333 moles of X remaining.

Your final correct answer is 1.3 mol X left over.

Answer from: Quest

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh $pcl_{3}$ +δh $cl_{2}$ ] - [δh $pcl_{5}$ ]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.

Answer from: Quest

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

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If 4.0 moles of x and 4.0 moles of y react according to the hypothetical reaction below, how many mo...

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