Review of Stoichiometry

Which of the following are chemically engineered products?

A mole is a measure of:

True or False: Only at STP will 1 mole of substance contain 6.02×10²³ particles.

How many inches are there in 18 yards?

How many atoms are there in 3 moles of H₂O ?

A mole ratio is:

Given the following balanced equation: N₂ +3H₂→2NH₃ Which of these is an INCORRECT mole ratio?

4NH₃(g) + 6NO(g)→5N₂(g) + 6H₂O(g) How many moles of each reactant were there if 13.7 moles of N₂(g) is produced?

NaCl, Cl₂ , C₂H₆O₂ : Which has the greatest GFM?

What is the GFM of Ca₃(PO₄)₂ ?

What is the mass of 2 moles of H₂S ?

What does STP stand for and what are its conditions?

If I have 1 mole of H₂O , how many L is that?

What is the first step in solving a problem in stoichiometry?

Ammonium nitrate decomposes according to the following equation: NH₄NO₃→N₂ + H₂O + O₂ Given that you start with 8 moles of NH₄NO₃ , how much O₂ will be produced? (Assume ideal conditions)

2Al +3Cl₂→2AlCl₃ When 0.8 kg grams of aluminum is reacted with excess chlorine gas, how many formula units of AlCl₃ are produced?

Sb₂S₃(s) + 3Fe(s)→2Sb(s) + 3FeS(s) If 3.87×10²³ particles of Sb₂S₃(s) are reacted with excess Fe(s), what mass of FeS(s) is produced?

CO(g) +2H₂(g)→CH₃OH(g) At STP, what volume of H₂(g) is needed to react completely with 8.02×10²³ molecules of CO(g)?

4Al +4O₂→2Al₂O₃ 13.2 moles of Al reacts completely with excess O₂ , how much 2Al₂O₃ is produced?

SiO₂(s) + 3C(s)→SiC(s) + 2CO(g) At STP, how many kg of SiO₂(s) reacted if 680 mL of CO(g) were produced?

At STP, which is equivalent to 1 mole?

I combine 75 L of hydrogen gas with excess iodine at STP. The resulting reaction is as follows: H₂ + I₂→2HI How many HI particles are produced?

You have 4 moles O₂ and 2 moles of FeS₂ and are given the following balanced equation: 4FeS₂ + 11O₂→2Fe₂O₃ +8SO₂ Which reactant is the limiting reagent?

Li₃N(s) +3H₂O(l)→NH₃(g) + 3LiOH(aq) How many mL of NH₃(g) are produced at STP when 7.88×10²⁴ molecules of water reacts with 120 grams of Li₃N(s) ?

The following equation is balanced: CaCO₃ +2HCl→CaCl₂ + CO₂ + H₂O Density is measured in grams/Liter. 345 grams of CaCO₃ reacts with excess HCl to produce 200 L of CO₂ . What is the density of the CO₂ ?

CaCO₃(s) + 176 kJ→CaO(s) + CO₂(g) What is the percent yield if 49.6 g of CaCO₃(s) produces 13.1 grams of CaO?

True or False: A percent yield of 90 % - 100 % is common in chemistry.

2Zn + O₂→2ZnO What is the percent yield of this reaction if 14 moles of ZnO are produced from the reaction of 256 grams of O₂ with excess Zn?

2KClO₃(s)→2KCl(s) + 3O₂(g) If the percent yield is 40%, how many atoms of O are produced from 6.02×10²³ formula units of KClO₃(s) ?

2KClO₃(s)→2KCl(s) + 3O₂(g) At STP, 9.83×10²⁴ formula units of KClO₃(s) decompose into KCl and 82 L of O₂(g) . What is the percent yield?

The amount of heat a substance has at a given temperature and pressure is known as:

C(s) + O₂(g)→CO₂(g) + 393.5 kJ What kind of reaction is this?

N₂(g) + O₂(g) + 43.2 kcal→2NO(g) What kind of reaction is this?

What is the atomic mass of magnesium-26?

2Mg(s) + O₂→2MgO(s) + 288 kcal How much heat is given off when 8.5 grams of magnesium-26 reacts with excess \ O₂ ?

CaCO₃(s) + 176 kJ→CaO(s) + CO₂(g) How much energy is required to decompose 10.4 moles of CaCO₃(s) ?

2CO₂(g) + 43.9 kJ→2CO(g) + O₂(g) How many molecules of 2CO₂(g) can be decomposed by the addition of 20 kcal of heat energy?

SO₃(g) + H₂O(l)→H₂SO₄(aq) + 129.6 kJ At STP, if 540 kJ is released, what volume of SO₃(g) was originally added?

True or False: The state (s,l,g,aq) of all reactants and products MUST be given in an enthalpy reaction.

2Cl(g)→C₂ What is the standard heat of formation for the reaction?

Which is the correct equation for heat of reaction?

2NO₂(g)→2NO(g) + O₂ Calculate the change in enthalpy for this equation given the following two heats of formation:

2SO₂(g) + O₂(g)→2SO₃(g) Find the heat of reaction for this equation given the following two heats of formation:

2SO₂(g) + O₂(g)→2SO₃(g) Find the heat of reaction for this equation given you have 4.5 moles of SO₂(g) , excess oxygen, and the following two heats of formation:

I had 1 mole of NaCl and I put it in 2 L of solution. Which of the following is FALSE?

3CaCO₃(s) + 2H₃PO₄(aq)→Ca₃(PO₄)₂(aq) + 3CO₂(g) + 3H₂O(l) How much 3CaCO₃(s) was added if 650 mL of 2.5 M Ca₃(PO₄)₂(aq) was produced?

Can the normality of a solution be numerically equivalent to its molarity?

I have a 1 N solution of Ca(OH)₂ and a 1 M solution of NaCl. Which of the following are equivalent?

2P₂O₅ +6H₂O→4H₃PO₄ After 0.32 moles of P₂O₅ is dropped in a beaker of water, 500 mL remains. What is the normality of the resulting solution?

2Na₂O₂(s) + 2H₂O(l)→O₂(g) + 4NaOH(aq) After 27.6 grams of Na₂O₂(s) is dropped into a beaker of water, 80 mL remains. What is the normality of the resulting solution?