the statement is false. (10 points) In a balanced chemical equation, coefficients indicate the relative number of molecules while the subscripts indicate the number of atoms in a molecule. Correct co
the statement is false. (10 points)
In a balanced chemical equation, coefficients indicate the relative number of molecules while the subscripts indicate the number of atoms in a molecule.
Correct coefficients in a balanced chemical equation results in equal number of each element in the reactants and products.
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To determine the amount in moles of a reactant from mass, the given mass is directly multiplied with the molar mass of the reactant.
Mass relationship ratios are directly indicated by the coefficients in a balanced chemical reaction.
In the equation: H2CO3 + 2NaOH → Na2CO3 + H2O, the mole ratio of the reactants can be written as 2 3 or 2 .
2 2 3
In the equation: P4 + 6 Cl2 → 4 PCl3, the mole ratio between Cl2 and PCl3 is 3Cl2:2PCl3.
The limiting reactant in the chemical reaction is always the reactant with the lowest number of moles at the start of the reaction.
In the reaction represented by the equation Na + Cl2 → 2 NaCl, if sodium (Na) is the limiting reactant, there would no sodium (Na) atoms left after the reaction.
For the balanced equation: HCl + KOH → KCl + H2O, the total mass of HCl and KOH is greater than the total mass of KCl and H2O.
In the amount of product approach for determining the limiting reactant, the limiting reactant produces the least amount of product.
PROBLEM SOLVING: Answer the following problems in the space provided. Box all final answers. (27 points)
11. Write the balanced chemical equation that describes the following chemical reaction: Solid barium hydroxide [Ba(OH)2] reacts with hydrochloric acid [HCl] to form barium chloride [BaCl2] and water . (2 points)
12. Write the balanced chemical equation for the reaction (2 points):
C5H12 + O2 →CO2 + H2O
13. In the balanced equation: N2 + 3F2 → 2NF3Determine the mass of nitrogen gas that would react with 25.7 g of F2. (MMN2 = 28.02 g/mol, MMF2 = 38.00 g/mol MMNF3 = 71.01 g/mol). Use dimensional analysis and set-up equation with proper units. 3 points)
14. In the balanced chemical equation: 2H2O2 → 2H2O + O2Determine the mass of water that would form from the decomposition of 35.1 g of hydrogen peroxide. (MMH2O2 = 34.016 g/mol MMH2O = 18.016 g/mol MMO2 = 32.00 g/mol. Use dimensional analysis and set-up equation with proper units. 3 points)
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the statement is false. (10 points)
For items 15-17: Consider the reaction : 2 NH3 + 4 F2 → N2F4 + 6 HF
Given the above equation, how many moles of N2F4 and HF do you expect to be
produced given 12.5 moles of F2 reacting with excess NH3? (3 points)
How many of moles of NH3 and F2 must have reacted to produce 20.5 moles of HF? (3 points)
17. How many moles of HF will be produced from the reaction of 18.4 moles of NH3 and 15.7 moles of F2? (3 points)
18. Consider the reaction: Pb(NO3)2 + 2KI → PbI2 + 2KNO3. If 165.6 grams of Pb(NO3)2 (MM = 331.2 g/mol) reacts with 498 grams of KI (MM = 166.0 g/mol):
What is the limiting reactant? Justify your answer. (2 points)
How many grams of PbI2 (MM = 461.0 g/mol) will be formed? (3 points)
C. How many grams of KNO3 (MM = 101.1 g/mol) will be formed? (3 points)
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