Balancing
Na metal burns in air, O2, to make sodium oxide. The correct balanced equation is:
What is:
4 Na (s) + O2 (g) --> 2 Na2O (s)
Fermentation is a chemical reaction of glucose, C6H12O6 (s) converting to ethanol, C2H5OH and carbon dioxide gas:
C6H12O6 (s) --> 2 C2H5OH (l) + 2CO2 (g).
The moles of carbon dioxide produced when 17.25 mol of glucose are reacted are:
What is 34.5 mol?
Mg + HCl --> MgCl2 + H2 Not balanced
The grams of hydrogen produced if we start with 2 moles of hydrochloric acid and excess magnesium:
Mg (s) + 2HCl --> MgCl2 + H2 (g)
What is 2 g H2 (g) ?
Mg + HCl --> MgCl2 + H2 not balanced
The mass of hydrogen produced from the reaction of 75.0 g HCl (MM=36.5 g/mol) and excess Mg is:
Mg (s) + 2 HCl (aq)--> MgCl2 (aq) + H2 (g)
What is 2.00 g H2?
1 ball + 1 bat = 1 player
3 Bats 4 Balls 6 Players
The Limiting Reactant:
What is 3 Bats?
Acetylene gas, C2H4, burns in air, O2, to make carbon dioxide and water. The correct, balanced equation is:
What is:
C2H4 + 3 O2 (g) --> 2 CO2(g) + 2 H2O (g)
Zn metal will dissolve in HCl, hydrochloric acid in a single displacement reaction:
Zn(s) + HCl (aq) --> ZnCl2 (aq) + H2 (g) Not balanced.
The number of moles of hydrogen gas produced when 16 mol of Zn react are:
Zn(s) + 2HCl (aq) --> ZnCl2 (aq) + 2H2 (g)
What is 32 mol H2?
Mg + HCl --> MgCl2 + H2 not balanced
The mass of hydrochloric acid (MM=36.5 g/mol) needed to react with 2.50 moles of magnesium is
Mg + 2 HCl --> MgCl2 + H2
What is 182 g HCl?
KClO3 --> KCl + O2 not balanced
The grams of KCl produced if 5.00 g of KClO3 is decomposed:
MM KClO3 =122.55 g/mol
MM KCl = 74.55 g/mol
2 KClO3 (s) --> 2 KCl (s) + 3 O2 (g)
What is 3.04 g KCl?
Car body + 4 Tires --> 1 car
The limiting reactant if you have 8 cars and 48 tires:
What is 8 Cars?
Silver sulfide(s) will decompose into silver metal and a form of sulfur, S8 (s). The balanced equation for this reaction is:
What is:
8 Ag2S (s) --> 16 Ag (s) + S8 (s)
CO2 (g) + LiOH (aq) --> Li2CO3 (aq) + H2O (l) Not balanced
How many moles of lithium hydroxide are required to react with 20 mol of CO2?
CO2 (g) + 2 LiOH (aq) --> Li2CO3 (aq) + H2O (l)
What is 40 mol LiOH?
The g of aluminum needed to combine with 1.58 mol of oxygen molecules to make aluminum oxide:
4 Al (s) + 3 O2 (g) --> 2 Al2O3 (s)
What is 56.84g Al?
Sodium and chlorine react to produce sodium chloride (table salt; MM=58.5 g/mol). ( MM Na (s) = 22.99 g/mol)
The amount of product that can be produced from 24.7 g of sodium and excess chlorine is:
2 Na (s) + Cl2 (g) --> 2 NaCl (s)
What is 62.9 g NaCl?
You want to make a BLT sandwich. Assuming you have an infinite supply of bread, you need two strips of bacon per sandwich, a slice of tomato and a leaf of lettuce. You can get ~ 6-8 slices in one tomato, 24 slices in a pack of bacon, and 20-30 leafs on a head of lettuce. You have a pack of bacon (2 strips per sandwich), a head of lettuce (1 head of lettuce = 20 sandwiches) and one tomato (= 6-8 slices)
The limiting Reactant:
What is the tomato?
Aqueous Potassium Bromide reacts with Iron (III) Hydroxide (s) in a double replacement reaction. The correct balanced equation is:
What is:
3 KBr (aq) + Fe(OH)3 (s) --> 3 KOH (aq) + FeBr3 (aq)
Mg (s) +O2 (g) --> MgO (s) not balanced
The moles of magnesium oxide produced from 1.2 moles of magnesium
2Mg (s) +O2 (g) --> 2MgO (s)
What is 1.2 mol MgO?
Ammonia decomposes to produce nitrogen and hydrogen gases. The g of H2 formed by the decomposition of 0.145 moles of ammonia:
2 NH3 (g) --> N2 (g) + 3 H2 (g)
What is 0.4394 g H2
Sodium hydroxide reacts with sulfuric acid (H2SO4; MM=98.1 g/mol) to form water and sodium sulfate.
The #grams of sodium sulfate (MM=124.0 g/mol) formed from 200.0 g NaOH (MM=40.00 g/mol) and an excess of sulfuric acid:
2 NaOH(aq)+H2SO4(aq) --> Na2SO4(aq) +2 H2O (l)
What is 310.0 g Na2SO4?
Aluminum oxide reacts with iron to form Fe3O4 and Aluminum. When 5 moles of aluminum oxide reacts with 7 moles of iron, the limiting reactant:
4 Al2O3(s) + 9 Fe(s) --> 3 Fe3O4(s) +8 Al(s)
5 mol Al2O3 x 8 Al/ (4 Al2O3) = 10 mol Al vs
7 mol Fe x 8 Al mol/(9 Fe) = 6.22 mol Al Least amount of Al made so Fe is limiting
Could have determined amount of Fe3O4 formed also. You will get the same answer of Fe = Limiting Reagent
What is iron?
The correct balanced equation for the double replacement reaction of aqueous ammonium phosphate reacting with aqueous lead (II) nitrate is:
What is:
2(NH4)3PO4 (aq) + 3 Pb(NO3)2 (aq) --> Pb3(PO4)2(s) + 6NH4NO3 (aq)
Ammonia, NH3, is widely used as a fertilizer and in many household cleaners. The moles of ammonia produced when 6 mol of hydrogen gas react with an excess of nitrogen gas:
3 H2 (g) + N2 (g) --> 2 NH3 (g)
What is 4 mol NH3?
Hydrogen and oxygen gases react under a specific set of conditions to produce water. The moles of oxygen required to produce 45.04 g of water:
2 H2 (g) + O2 (g) --> 2 H2O (l)
What is 1.25 mol O2?
When copper (II) chloride reacts with sodium nitrate, copper (II) nitrate and sodium chloride are formed.
If 15.0 g CuCl2 (MM=134.5 g/mol) react with excess NaNO3, the g of sodium chloride (MM = 58.50 g/mol) formed:
CuCl2(aq) +2NaNO3(aq) -> Cu(NO3)2(aq) +2 NaCl(aq)
What is 13.05 g NaCl?
Chlorine gas reacts with potassium bromide to produce potassium chloride and bromine gas. The grams of potassium chloride can be produced from 300. g each of chlorine and potassium bromide:
MM Cl2 = 70.91 g/mol
MM KBr = 119.00 g/mol
Cl2(g) + 2 KBr (s) --> 2KCl (s) + Br2 (g)
300.g KBr x 1mol KBr/(119.00 g KBr)= 2.52mol KBr
300.g Cl2 x 1 mol Cl2 /(70.91 g Cl2) = 4.23 mol Cl2
Determine the mol of KCl that can be made from the mol of Cl2 and from the mol of KBr.
What is 188 g KCl?