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Chapter 3: 3.58P (page 89)

What does the term stoichiometrically equivalent ratio mean, and how it is applied in solving problem?

Short Answer

Expert verified

The definite quantity of one substance that reacts with a definite quantity of all remaining other substanes which can be represented in the form of a chemical equation is known as a stoichiometrically equivalent molar ration.

1). Identification of reactants and products

Example. Magnesium, oxygen, magnesium oxide.

2). Physical states of reactants and products.

Example. (s) solid, (g) gas, (l) liquid and (aq) solution.

3). Mole ratios of raectants and products.

2 moles Mg to 1 mole O2 to 2 moles MgO.

Step by step solution

01

Step 1. Considering the following chemical equations: 

2Mgs+O2g鈫�2MgOs

Here Mg and O2 are reactants, MgO is the product and the arrow indicates the direction of the reaction proceed.

Whereas (s) indicates solid, (g) is gas. Also, 2 Mg indicates 2 moles of Mg, and 2 MgO is referred to as 2 moles of MgO.

02

Step 2. The following points define which types of information does a balanced chemical eqyation provides:

1). Identification of reactants and products

Example. Magnesium, oxygen, magnesium oxide.

2). Physical states of reactants and products.

Example. (s) solid, (g) gas, (l) liquid, and (aq) solution.

3). Mole ratios of raectants and products.

2 moles Mg to 1 mole O2 to 2 moles MgO.

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Most popular questions from this chapter

Lead(II) chromate (PbCrO4) is used as the yellow pigment in traffic lanes, but is banned from house paint because of the risk of lead poisoning. It is produced from chromite (FeCr2O4), an ore of chromium:

4FeCr2O4(S)+8K2CO3(aq)+7O2(g)鈫�2Fe2O3(s)+8K2CrO4(aq)+8CO2(g)

Lead(II) ion then replaces the K+ ion. If a yellow paint is 0.511% PbCrO4 by mass, how many grams of chromite are needed per kilogram of paint?

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2CH3CH2OH(I)鈫�CH3CH2OCH3CH2(I)+H2O(g)

In a side reaction, some ethanol forms ethylene and water:

CH3CH2OH(I)鈫�CH2=CH2(g)+H2O(g)

(a) If 50.0 g of ethanol yields 35.9 g of diethyl ether, what is the percent yield of diethyl ether? (b) During the process, 45.0% of the ethanol that did not produce diethyl ether reacts by the side reaction. What mass of ethylene is produced?

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