Question

s to out ot 1.00 O d. comvert given quentities to masses Not yet answered equation for the reaction is shown Moles 02 =- Queation 8

Answer 1

6. ANSWER: b (convert given quantities to moles)

Stoichiometry: Mathematical relationship between the number of reactants and products

Almost all stoichiometric problems can be solved in just four simple steps:

1. Balance the equation.
2. Convert units of a given substance to moles.
3. Using the mole ratio, calculate the moles of substance yielded by the reaction.
4. Convert moles of wanted substance to desired units.

7. ANSWER: C (3moles of O₂/ 4 moles of Sb)

Explanation:

1. First balance the given equation. (already balanced)

2. 1 mole of Sb = 121.757 g of Sb

To complete the reaction, 4 moles of Sb needs 3 moles of oxygen.

For, 75g Sb => 75g Sb* (1 mole Sb/121.757g Sb) * (3 moles of O₂/4moles of Sb)

=> 0.4619 moles of oxygen

So, in blank it should be 3moles of O₂/ 4 moles of Sb.

8. ANSWER: A (9 moles of reactants chemically change into 11 moles of products)

From given details directly can predict 1 mole of pentane and 8 moles of oxygen, totally 9 moles in reactant side, gives 5 moles of CO₂ and 6 moles of water, sum is 11 moles in product side.

Hence, the statement 9 moles of reactants chemically change into 11 moles of product is correct.