Question

question 23 (4 points)
given that zinc reacts with iodine in the fixed mass ratio of 1 gram of zinc to 3.88 grams of iodine, how many grams of iodine are required to completely react with 4.2 grams of zinc?
a) 3.88 g
b) 16.3 g
c) 4.2 g
d) 1.00 g

Explanation:

Step1: Set up the proportion

Let \(x\) be the mass of iodine. The ratio is \(\frac{1}{3.88}=\frac{4.2}{x}\).

Step2: Solve for \(x\)

Cross - multiply: \(x = 3.88\times4.2\).
Calculate \(3.88\times4.2=(4 - 0.12)\times4.2=4\times4.2-0.12\times4.2 = 16.8-0.504=16.296\approx16.3\).

Answer:

B) \(16.3\ g\)