Zinc oxide contains 80.3% zinc.What size sample of zinc oxide would contain 5.35g of zinc?

Question

Quizplus · Accepted Answer

To find out the size of the sample, we need to use the fact that zinc oxide contains 80.3% zinc. This means that in every 100g of zinc oxide, there is 80.3g of zinc. We can use this information to set up a proportion:

80.3g zinc / 100g zinc oxide = 5.35g zinc / x (size of sample)

Cross-multiplying, we get:

80.3g zinc * x = 100g zinc oxide * 5.35g zinc

Simplifying, we get:

x = (100g zinc oxide * 5.35g zinc) / 80.3g zinc

x = 6.66g zinc oxide

Therefore, the answer is B.

Zinc Oxide Contains 80