Conversions
How many moles of Sodium will react with Water to produce 4.0 mol of Hydrogen in the following reaction?
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
8.0 mol Na
What is a limiting reactant?
1. The reactant that is used up first and prevents more product from being made.
2. The reactant that makes the product.
3. The reactant that is used up last and prevents more product from being made
4. The substance that is in excess that doesn’t get used up as a reactant.
1. The reactant that is used up first and prevents more product from being made.
Which coefficient placed before HCl will balance the following equation?
Zn(s) + HCL(g) →ZnCl2(s) + H2(g)
2
Write the balanced equation:
When potassium chlorate (KClO3) is heated, it decomposes to form KCl and oxygen gas (O2).
2 KClO3→2 KCl + 3 O2
What mass of phosphorus will be needed to produce 3.25 mol of P4010?
4P(s) + 502(g) → P4O10(S)
403 g P
For the combustion of sucrose, there are 10.0 g of sucrose and 10.0 g of oxygen reacting. Which is the limiting reagent?
C12H22O11 + 12O2 ---> 12CO2 + 11H2O
Oxygen
Balance the chemical equation for the reaction of aluminum metal with oxygen gas to produce solid aluminum oxide:
Al (s) + O2 (g) → Al2O3 (s)
4Al (s) + 3O2 (g) → 2Al2O3 (s)
In the equation shown below, 7.24 grams of potassium phosphate reacts with 3.45 grams of aluminum nitrate. Determine the limiting and excess reacant.
1K3PO4 (aq) + 1Al(NO3)3 (aq) → 3KNO3 (aq) + 1AlPO4 (aq)
Limiting - K3PO4
Excess - Al(NO3)3
What mass of acetylene, C2H2, will be produced from the reaction of 90. g of calcium carbide, CaC2, with water in the following reaction?
CaC2(s) + 2H2O(l) → C2H2(g) + Ca(OH)2(s)
37 g C2H2
50.0g of Mg reacts with 4.0 dm3 of Oxygen.
a)What mass of MgO is produced?
b) What is the limiting reagent?
2Mg + O2→2MgO
a) 8.5g MgO
b) Mg
Balance the chemical equation for the combustion of butane liquid (C4H10) in the presence of oxygen gas to yield carbon dioxide and water in the gaseous phase:
C4H10 (l) + O2 (g) → CO2 (g) + H2O (g)
2C4H10 (l) + 13O2 (g) → 8CO2 (g) + 10H2O (g)
How much heat is released when 583g of SO3 reacts with water?
SO3 + H2O → H2SO4 + 129.6kJ
944 kJ
If 50.0 g of Ethanol is burned, how many liters of Carbon Dioxide (C02) are produced at STP?
C2H5OH (l) + 3O2 (g) → 2CO2 (g) + 3H2O (g)
48.7 L CO2
10 g of marble(calcium carbonate) was added to 15 g of dilute hydrochloric acid, product formed is calcium chloride, water and carbon dioxide. Which of the following is true
1. Hydrochloric acid is the limiting reactant
2. Hydrochloric acid is the excess reactant
3. Calcium carbonate is the excess reactant
4. None of the above
2. Hydrochloric acid is the excess reactant
Balance the combustion reaction of hexane (C6H12):
C6H12 (l) + O2 (g) → CO2 (g) + H2O (l)
C6H12 (l) + 9O2 (g) → 6CO2 (g) + 6H2O (l)
0.45 grams of the solid product was produced in the lab, calculate the percent yeild.
84.2%
If 10.0 g of Magnesium reacts with excess Hydrochloric acid, how many atoms of Magnesium are consumed in the reaction?
Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)
2.48 x 10^23 atm Mg
Q9. If 4.95 g of ethylene (C2H4) are combusted with 3.25 g of oxygen. What is the limiting reagent?
O2
Balance the following combustion reaction for Octane (C8H18):
C8H18 (l) + O2 (g) → CO2 (g) + H2O (l)
2C8H18 (l) + 25O2 (g) → 16CO2 (g) + 18H2O (l)
During this reaction, 5.71g of CuI is produced. How many grams of I2 are produced also?
3CuCl2 (aq) + 5KI (aq) → 3CuI (s) + 5KCl (aq) + I2 (s)
8.05g I2