Basic Reactions (Balancing)
What is the balanced form of:
4K + O2 → __ K2O
2K2O
How many moles of K2O are made from 1.52 mol K?Equation: 4K + O₂ → 2K₂O
0.76 mol K2O
What’s the formula equation for: Potassium + Oxygen → Potassium Oxide
4K + O2 → 2K2O
How many moles of Cr(NO₃)₃ are formed from 0.85 mol Pb(NO₃)₄?
Equation: 4Cr + 3Pb(NO₃)₄ → 4Cr(NO₃)₃ + 3Pb
1.13 mol Cr
How many grams of water (H₂O) are produced from 2.00 mol of hydrogen gas (H₂)?
2H₂ + O₂ → 2H₂O
36.0 g H₂O
Balance: 2Cu + S → ___
Cu2S
How many moles of Cu are needed to make 0.25 mol Cu2S?
Equation: 2Cu + S → Cu₂S
0.5 mol Cu
Copper + Sulfur → Copper(I) sulfide
2Cu + S → Cu2S
What is the balanced formula for: Chromium + Lead(IV) nitrate → Chromium(III) nitrate + Lead?
4Cr + 3Pb(NO₃)₄ → 4Cr(NO₃)₃ + 3Pb
How many grams of CO₂ are produced from 88.0 g of propane (C₃H₈)?
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
132.0 g CO₂
Balance the equation for:
Na + H2SO4 → Na2SO4 + H2
2Na + H2SO4 → Na2SO4 + H2
How many moles of Na are needed for 3.75 mol Na2SO4?
Equation: 2Na + H₂SO₄ → Na₂SO₄ + H₂
7.5 mol Na
Sodium + Sulfuric Acid → Sodium Sulfate + Hydrogen
2Na + H2SO4 → Na2SO4 + H2
How many moles of chromium(III) oxide (Cr₂O₃) are produced when 1.00 mol of chromium (Cr) reacts with oxygen gas?
Hint: Make an equation
0.50 mol Cr₂O₃
How many grams of zinc will be formed if 32.0 g of copper reacts with zinc nitrate? Copper(I)nitrate is the other product.
16.5 gZn
Balance: Fe2O3 + Ca3(PO4)2 → Fe(PO4) + CaO
2Fe2O3 + 3Ca3(PO4)2 → 6FePO4 + 9CaO
How many moles of CaO are made from 1.6 mol Fe2O3?
Equation: 2Fe₂O₃ + 3Ca₃(PO₄)₂ → 6FePO₄ + 9CaO
7.2 mol CaO
Iron(III) Oxide + Calcium Phosphate → Iron(III) Phosphate + Calcium Oxide
2Fe2O3 + 3Ca3(PO4)2 → 6FePO4 + 9CaO
How many moles of copper(I) oxide (Cu₂O) will be formed from 2.00 mol of copper (Cu)?
Hint make an equation
1.00 mol Cu₂O
Aluminum reacts with 42 g of iron(II) sulfate. How many grams of iron are formed? Aluminum sulfate is the other product?
15 gFe
Balance: Mg(ClO3)2 → MgCl2 + O2
2Mg(ClO3)2 → 2MgCl2 + 3O2
How many mol O2 are made from 5.12 mol Mg(ClO3)2?
Equation: 2Mg(ClO₃)₂ → 2MgCl₂ + 3O₂
7.68 mol O2
Magnesium Chlorate → Magnesium Chloride + Oxygen
2Mg(ClO3)2 → 2MgCl2 + 3O2
How many moles of iron(III) bromide (FeBr₃) are formed from 0.75 mol of iron (Fe) and excess bromine?
0.75 mol FeBr₃
What volume of oxygen is produced at STP when 6.58 x 1024 molecules of water is decomposed according to the following reaction?
122L O2