Final answer:
To find the amount of zinc in a compound with a zinc-to-copper ratio of 4 to 11 and 374 grams of copper, set up a proportion and solve for the mass of zinc, which is 136 grams.
Step-by-step explanation:
The student is asking how to determine the amount of zinc in a chemical compound given the amount of copper and the ratio of zinc to copper. The ratio of zinc to copper is provided as 4 to 11, which means for every 4 grams of zinc, there are 11 grams of copper. If we know there are 374 grams of copper in the jar, we can set up a proportion to find the mass of zinc:
4 grams of Zn / 11 grams of Cu = x grams of Zn / 374 grams of Cu
To solve for x, cross-multiply and divide:
x = (4 grams of Zn / 11 grams of Cu) × 374 grams of Cu
x = (4 × 374) / 11
x = 136 grams of Zn (rounded to the nearest gram)
Therefore, the chemical contains 136 grams of zinc.