CHEM 103 EXAM 2 QUESTIONS AND
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT RATED
A+ NEWLY UPDATED 2026
Homework 5 - empirical formula -ANSWER ✔✔.
A compound is found to be composed of 89.1% chlorine, 0.844% hydrogen and
10.06% carbon; what is its empirical formula? -ANSWER ✔✔HCCl3
A compound is found to be composed of 94.1% oxygen and 5.88% hydrogen;
what is its empirical formula? -ANSWER ✔✔OH
A compound is found to be composed of 18.29% lithium, 10.62% hydrogen and
71.09% aluminum; what is its empirical formula? -ANSWER ✔✔H4AlLi
A compound is found to be composed of 28.58% boron, 10.66% hydrogen and
60.77% sodium; what is its empirical formula? -ANSWER ✔✔H4NaB
A compound is found to be composed of 47.62% chlorine, 21.49% oxygen and
30.88% sodium; what is its empirical formula? -ANSWER ✔✔ClONa
A compound is found to be 38.76% calcium, 19.97% phosphorous and 41.28%
oxygen. What is the empirical formula for this compound? -ANSWER
✔✔Ca3P2O8;
homework 6 - stoichiometry -ANSWER ✔✔.
, The production of ammonia (NH3) from its elements using the Haber process is
arguably the single most significant industrial chemical reaction in the world.
Assuming only integer coefficients, what is coefficient for hydrogen in the
balanced chemical equation for this process? -ANSWER ✔✔3
Nitrogen is 78% of the atmosphere and thus abundant and cheap. Hydrogen is a
very energy concentrated fuel and thus expensive. In the Haber process, the
reaction is designed to use all of the hydrogen. Determine the amount of
ammonia expected from the reaction of 7,500 kg of hydrogen. -ANSWER
✔✔42500 kg NH3
In practice, about 97% of the hydrogen is converted to ammonia. Thus how
much ammonia is likely to be recovered in the previous question? -ANSWER
✔✔about 41000 kg NH3
Potassium perchlorate (KClO3) may be decomposed into potassium chloride
(KCl) and oxygen. In the balanced chemical equation (assuming all integer
coefficients), what is the coefficient in front of oxygen? -ANSWER ✔✔3
2.35 g of potassium perchlorate is decomposed according to the reaction is the
previous question. How much oxygen is expected to be formed? -ANSWER
✔✔0.921
If 1.18 g of KCl is collected after the reaction, calculate the percentage yield of
this product. -ANSWER ✔✔82.5%
homework 7 - molar volume -ANSWER ✔✔.
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT RATED
A+ NEWLY UPDATED 2026
Homework 5 - empirical formula -ANSWER ✔✔.
A compound is found to be composed of 89.1% chlorine, 0.844% hydrogen and
10.06% carbon; what is its empirical formula? -ANSWER ✔✔HCCl3
A compound is found to be composed of 94.1% oxygen and 5.88% hydrogen;
what is its empirical formula? -ANSWER ✔✔OH
A compound is found to be composed of 18.29% lithium, 10.62% hydrogen and
71.09% aluminum; what is its empirical formula? -ANSWER ✔✔H4AlLi
A compound is found to be composed of 28.58% boron, 10.66% hydrogen and
60.77% sodium; what is its empirical formula? -ANSWER ✔✔H4NaB
A compound is found to be composed of 47.62% chlorine, 21.49% oxygen and
30.88% sodium; what is its empirical formula? -ANSWER ✔✔ClONa
A compound is found to be 38.76% calcium, 19.97% phosphorous and 41.28%
oxygen. What is the empirical formula for this compound? -ANSWER
✔✔Ca3P2O8;
homework 6 - stoichiometry -ANSWER ✔✔.
, The production of ammonia (NH3) from its elements using the Haber process is
arguably the single most significant industrial chemical reaction in the world.
Assuming only integer coefficients, what is coefficient for hydrogen in the
balanced chemical equation for this process? -ANSWER ✔✔3
Nitrogen is 78% of the atmosphere and thus abundant and cheap. Hydrogen is a
very energy concentrated fuel and thus expensive. In the Haber process, the
reaction is designed to use all of the hydrogen. Determine the amount of
ammonia expected from the reaction of 7,500 kg of hydrogen. -ANSWER
✔✔42500 kg NH3
In practice, about 97% of the hydrogen is converted to ammonia. Thus how
much ammonia is likely to be recovered in the previous question? -ANSWER
✔✔about 41000 kg NH3
Potassium perchlorate (KClO3) may be decomposed into potassium chloride
(KCl) and oxygen. In the balanced chemical equation (assuming all integer
coefficients), what is the coefficient in front of oxygen? -ANSWER ✔✔3
2.35 g of potassium perchlorate is decomposed according to the reaction is the
previous question. How much oxygen is expected to be formed? -ANSWER
✔✔0.921
If 1.18 g of KCl is collected after the reaction, calculate the percentage yield of
this product. -ANSWER ✔✔82.5%
homework 7 - molar volume -ANSWER ✔✔.
