Writing Chemical Equations
Write the balanced equation for: solid potassium and liquid water yield hydrogen and solid potassium hydroxide.
2 K (s) + 2 H2O(l) → H2(g) + 2 KOH(s)
3 CaBr2 + 2 K3PO4 → Ca3(PO4)2 + 6 KBr
If 21.160 grams of CaBr2 are reacted, how many grams of K3PO4 will also be reacted?
14.980 grams K3PO4
Cu2S + O2 → 2 Cu + SO2
If 407 grams of Cu2S are reacted with 376 grams of O2, how many moles of Cu will be produced?
5.11 moles Cu
(Cu2S is the limiting reagent)
P4 + 5 O2 → P4O10
When 250 grams of O2 are reacted, 290 grams of P4O10 are produced. What is the percent yield of this reaction?
How many moles of KClO3 must decompose to produce 9 moles of oxygen gas?
6 moles KClO3
Write the balanced chemical equation:
Sodium combines with chlorine to produce solid sodium chloride
2 Na(s) +Cl2(g) → 2 NaCl(s)
Fe3O4 + 4 CO → 3 Fe + 4 CO2
How many moles of CO are needed to react with 16.5 g of Fe3O4?
0.285 moles CO
CaC2 + 2 H2O → C2H2 + Ca(OH)2
If 200. grams of CaC2 are reacted with 2.1 moles of H2O, how many liters of C2H2 will be produced at STP?
24 liters C2H2
(H2O is the limiting reagent)
2 K + MgBr2 → 2 KBr + Mg
When 191 grams of KBr are produced, 241 grams of MgBr2 was reacted. What is the percent yield of this reaction?
61.3%
How many grams of NaCl will be produced from 1.25 mol of chlorine gas reacting with sodium?
146 g NaCl
Write the balanced chemical equation:
Solid ammonium nitrate decomposes, yielding dinitrogen monoxide gas and liquid water.
NH4NO3(s) → N2O(g) + 2 H2O(l)
H2SO4 + Ba(OH)2 → BaSO4 + 2 H2O
If 437.84 grams of H2SO4 are reacted, how many grams of H2O will be produced?
160. 85 g H2O
2 NaCl + Pb(NO3)2 → 2 NaNO3 + PbCl2
How many grams of lead (II) chloride are produced from the reaction of 15.3 g of NaCl and 60.8 g of Pb(NO3)2?
36. 4 g
2 Ge + O2 → 2 GeO
When 146 grams of O2 are reacted, 784 grams of GeO are produced. What is the percent yield of this reaction?
97.0%
Ammonium nitrate decomposes into dinitrogen monoxide gas and water. Determine the amount of water produced if 25.0 g of ammonium nitrate decomposes.
11.3 g H2O
Write the balanced chemical equation:
Solid sodium carbonate decomposes to produce solid sodium oxide and gaseous carbon dioxide
Na2CO3(s) → Na2O(s) + CO2(g)
4 P + 5 O2 → 2 P2O5
If 210 grams of P are reacted, how many grams of P2O5 will be produced?
480 g P2O5
A 2.00 g sample of ammonia reacts with 4.00 g of oxygen according to the equation
4 NH3+5 O2 → 4 NO + 6 H2O.
How much excess reactant remains after the reaction has stopped?
0.30 g
C + 2 H2 → CH4
If 464.23 grams of CH4 are produced, how many grams of H2 were reacted if the reaction proceeds with a 59.786% yield?
195.14 grams H2
Suppose 316.0 g aluminum sulfide reacts with 493.0 g of water to produce aluminum hydroxide and hydrogen sulfide gas (H2S). What mass of the excess reactant remains after the reaction is complete?
265.5 g
Predict the products and write the balanced chemical equation.
Butane [C4H10] reacts in oxygen gas to form ________.
Carbon dioxide and water
2 C4H10 (g) + 13 O2(g) → 8 CO2 (g) + 10H2O (g)
BaCl2 + 2 AgNO3 → 2 AgCl + Ba(NO3)2
If 321 grams of AgNO3 are reacted, how many grams of Ba(NO3)2 will be produced?
247 grams Ba(NO3)2
SO2 + PCl5 → SOCl2 + POCl3
How many grams of the excess reactant are left over when 16.2g SO2 reacts with 13.7g PCl5?
Molar Mass: SO2 = 64.07 g/mol & PCl5 = 208.24 g/mol & SOCl2 = 118.97 g/mol
11.98 g
4 Al + 3 O2 + 6 H2O → 4 Al(OH)3
If 1.3500 liters of O2 are reacted at STP, how many grams of Al(OH)3 will be produced if the reaction proceeds with a 99.87% yield?
6.2600 grams Al(OH)3
The reaction of 4.25 g of Cl2 with 2.20 g of P4 produces 4.28 g of PCl5. What is the percent yield?
85.8%