Question

1. ASSESSMENT
Directions. Read and analyze each problem below. Choose at least two (2) problems and
show your step-by-step process in solving or the solution
Problems
What is the percent by mass if 8. Og copper is added to enough zinc to produce 100g
alloy?
D. 0.05%
A. 0.08%
B. 0.07%
C. 0.06%
2. What is the percentage concentration in the following solution given 2g sucrose in 80g
water?
A. 2.4%
B. 2.5%
C 40%
D. 97.6%
3.
A solution of benzene and toluene was prepared by adding toluene to benzene until
the total volume becomes 135mL. By volume, the solution is 30.0% benzene. How
much benzene, in ml, is in the solution?
A. 39.5mL of benzene
C. 41.5mL of benzene
B. 40.5mL of benzene
D. 42.5mL of benzene
4. Brass is a copper-zinc alloy. If the concentration of zinc is relatively low, the brass has
a golden color and is often used for inexpensive jewelry. If a 35.0g pendant contains
1.7g of zinc, what is the % by mass of zinc in brass?
A. 4.7%
B 4.8%
C. 4.9%
D. 10%
​

Answer 1

Explanation:

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Answer 2

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