Q3: Week 5 – Archive
1:Review of Stiochiometry problems
- 2H2O2 → 2H2O + O2
- 2H2 + O2 → 2H2O
- H2SO4 + Mg → H2 + MgSO4
- HCl + KOH → KCl + H2O
Al2(SO4)3 + 6NaOH → 2Al(OH)3 + 3Na2SO4
The mole ratio of NaOH to Al(OH)3 is
- 1:1
- 1:3
- 3:1
- 3:7
- the mass ratios of the substances in the reaction
- the mole ratios of the substances in the reaction
- the total number of electrons in the reaction
- the total number of elements in the reaction
2C6H14 + ______ O2 → 12CO2 + 14H2O
What is the coefficient of O2 when the equation is completely balanced using the smallest whole-number coefficients?
- 13
- 14
- 19
- 26
- 7
- 9
- 3
- 4
6. Vitamin C, also known as ascorbic acid, is water soluble and cannot be produced by the human body. Each day, a person’s diet should include a source of vitamin C, such as orange juice. Ascorbic acid has a molecular formula of C6H8O6 and a gram-formula mass of 176 grams per mole.
Which formula represents the empirical formula for ascorbic acid?
- C6H8O6
- CHO
- C2H2O2
- C3H4O3
2H2 + O2 → 2H2O
What is the mass of H2O produced when 10.0 grams of H2 reacts completely with 80.0 grams of O2?
- 70.0 g
- 90.0 g
- 180. g
- 800. g
2C2H6 + 7 O2 → 4CO2 + 6H2O
Determine the total number of moles of oxygen that react completely with 8.0 moles of C2H6.
- CH2O
- C2H4O2
- C3H8O
- C4H8O4
- H2 + O2 → H2O
- H2 + O2 → 2H2O
- 2H2 + O2 → 2H2O
- 2H2 + 2O2 → 2H2O
1. What is the gram-formula mass of Fe(NO3)3?
- 146 g/mol
- 194 g/mol
- 214 g/mol
- 242 g/mol
Which molecular formula and empirical formula represent this compound?
- C2HNO2 and CHNO
- C2HNO2 and C2HNO2
- C4H2N2O4 and CHNO
- C4H2N2O4 and C2HNO2
Cl2 + 2NaBr → 2NaCl + Br2
2NaCl → 2Na + Cl2
Which types of chemical reactions are represented by these equations?
- single replacement and decomposition
- single replacement and double replacement
- synthesis and decomposition
- synthesis and double replacement
- FeS
- Fe2S3
- FeSO3
- Fe2(SO3)3
- 1.0 g
- 4.8 g
- 48 g
- 480 g

Which product formula correctly completes the equation?
- COH2
- H2O
- NaOH
- COOH
- one mole of NO2
- one molecule of NO2
- two moles of NO
- two molecules of NO
- 19 g
- 36 g
- 39 g
- 84 g
- 0.30 mol
- 1.5 mol
- 4.5 mol
- 7.5 mol
- 16 mol
- 20. mol
- 64 mol
- 80. mol
- 1:1:2
- 1:1:3
- 1:4:6
- 5:1:4
- Na + Cl2 → NaCl
- Al + Br2 → AlBr3
- H2O → H2 + O2
- PCl5 → PCl3 + Cl2
- C2H3
- C4H6
- C6H9
- C8H12
15. A hydrate is a compound that includes water molecules within its crystal structure. During an experiment to determine the percent by mass of water in a hydrated crystal, a student found the mass of the hydrated crystal to be 4.10 grams. After heating to constant mass, the mass was 3.70 grams. What is the percent by mass of water in this crystal?
- 90.%
- 11%
- 9.8%
- 0.40%
16. What is the total number of atoms contained in 2.00 moles of nickel?
- 58.9
- 118
- 6.02 × 1023
- 1.20 × 1024
3/13 – Friday – period 7/8
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