#3.) Hydrogen and oxygen react to produce water, according to the reaction 2H2 (g) + O2 (g) → 2H2O (l). If 3 moles of hydrogen react with 2 moles of oxygen and the yield in the reaction is 80%, how many moles of water are obtained?

Select one:
a. 2 moles
b. 2.4 moles
c. 2.7 moles
d. 3 moles

#4.) Which of the following is true about the total number of reactants and the total number of products in the reaction shown below?C5H12(l) + 8O2(g) → 5CO2(g) + 6H2O(g)

Select one:
a. 9 moles of reactants chemically change into 11 moles of product.
b. 9 grams of reactants chemically change into 11 grams of product.
c. 9 liters of reactants chemically change into 11 liters of product.
d. 9 atoms of reactants chemically change into 11 atoms of product.

#9.) How many moles of Cu are needed to react with 1.23 moles of AgNO3?
Cu + 2AgNO3 → Cu(NO3)2 + 2Ag
Select one:
a. 0.62
b. 2.5
c. 3.51
d. 0.55

Explanation : In the reaction we can see that the number of moles of hydrogen are equal to the number of water molecules formed. Also, oxygen is found t o be the limiting reactant as equal number of moles are not produced in the reaction.

Here when we use 3 moles of hydrogen then 3 moles of water will be produced. As we are ignoring the moles of oxygen here as that is a limiting reactant.

Answer 2) Option A) 9 moles of reactants chemically change in to 11 moles of product.

Explanation : We can see that 1 mole of pentane reacts with 8 moles of oxygen to produce 5 moles of carbon dioxide and 6 moles of water. So when we add the reactants side we get 1 + 8 = 9 moles and in products it has 5 + 6 = 11 moles.

Hence, 9 moles of reactants produce 11 moles of products.

Answer 3) Option A) 0.62 moles.

Explanation : Here, the number of moles of Cu reacts with 2 moles of silver nitrate and gives 1 mole of copper nitrate and 2 moles of silver.

So, the ratio is 1 : 2 in the reactants side, Now, when we have 1.23 moles of silver nitrate then to calculate the number of Cu.

we can simply cross multiply and get the answer as 1.23 / 2 = 0.615 = ~ 0.62 moles.

nikitarahangdaleVT nikitarahangdaleVT · Answer 2 · 2022-03-19T08:55:33+01:00

3 moles, 9 moles of reactants chemically change into 11 moles of product and 0.62 moles are the correct answers of the given question.

What is the stoichiometry?

Stoichiometry of any reaction tells about the relative amount of reactant and product present in that reaction.

(1). In the given reaction:

2H₂ (g) + O₂ (g) → 2H₂O (l)

From the stoichiometry of the reaction it is clear that all moles of hydrogen convert into water molecule and react as limiting reagent. When 3 moles of hydrogen are present in the reaction then it will produce 3 moles of water.

(2). Given chemical reaction is:

C₅H₁₂(l) + 8O₂(g) → 5CO₂(g) + 6H₂O(g)

From the stoichiometry of the reaction, it is clear that whole 9 moles of reactant (1 mole of C₅H₁₂ + 8 mole of O₂) will change into 11 moles of product (5 moles of CO₂ + 6 moles of H₂O).

(3). Given chemical reaction is:

Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag

From the stoichiometry it is clear that,

1 mole of Cu = react with 2 moles of AgNO₃

1 mole of AgNO₃ = react with 1/2 moles of Cu

1.23 moles of AgNO₃ = react with 1/2×1.23=0.615 or 0.62 moles of Cu

Hence, option (d), option (a) and option (a) are the correct answers of the given questions.

To know more about stoichiometry, visit the below link:

https://brainly.com/question/16060223