Answer to Question #168819 in General Chemistry for mel

Question

1.) Iodine is prepared both in the laboratory and commercially by adding Cl₂ (g) to an aqueous solution containing sodium iodide.

2NaI(aq) + Cl₂(g) --> I₂ (s) + 2NaCl(aq)

How many grams of sodium iodide, NaI, must be used to produce 87.1 g of iodine, I₂?

mass:__________?____________g NaI

2.) The Ostwald process is used commercially to produce nitric acid, which is, in turn, used in many modern chemical processes. In the first step of the Ostwald process, ammonia is reacted with oxygen gas to produce nitric oxide and water.

What is the maximum mass of H₂O that can be produced by combining 73.8 g of each reactant?

4NH₃(g) + 5O₂(g) --> 4NO(g) + 6H₂O(g)

mass:_______?_______g H₂O

3.) Combining 0.352 mol Fe₂O₃ with excess carbon produced 14.8 g Fe.

Fe₂O₃ + 3C --> 2Fe + 3CO

what is the actual yield of iron in moles?

actual yield:_________?____________mol

what is the theoretical yield of iron in miles?

theoretical yield:________?___________mol

what is the percent yield?

percent yield:_________?__________%

4.) Chlorine gas can be prepared in the laboratory by the reaction of hydrochloric acid with manganese(IV) oxide.

4HCl(aq) + MnO₂(s) --> MnCl₂ (aq) + 2H₂O(l) + Cl₂(g)

A sample of 34.5 g MnO₂ is added to a solution containing 50.5g HCl.

what is the limiting reactant? MnO₂ or HCl

what is the theoretical yield of Cl₂?

theoretical yield:________?_______g Cl₂

If the yield of the reaction is 87.3%, what is the actual yield of chlorine?

Actual yield:_________?________g Cl₂

5.) Assuming an efficiency of 38.70%, calculate the actual yield of magnesium nitrate formed from 130.7g of magnesium and excess copper (II) nitrate

Mg + Cu(NO₃)₂ --> Mg(NO₃)₂ + Cu

Actual yield:_________?_______g

6.) A sample of 9.65g of solid calcium hydroxide is added to 33.5 mL of 0.500 M aqueous hydrochloric acid.

write the balanced chemical equation for the reaction. Physical states are optional.

Chemical equation:____________________?

what is the limiting reactant? hydrochloric acid or calcium hydroxide

How many grams of salt are formed after the reaction is complete?

mass of salt:__________?____________g

how many grams of the excess reactant remain after the reaction is complete?

excess reactant remaining:___________?_______g

Answer 1

1) mass = 102.82g NaI

2) mass = 49.80g H₂O

3) actual yield of iron in moles = 0.264 mol

theoretical yield of iron in moles = 0.704 mol

% yield = 37.54%

4) actual yield = 21.433g Cl₂

theoretical yield = 24.495g Cl₂

5) actual yield = 298.4g

6) mass of salt = 0.929g

Excess reactant remaining = 9.00g

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