Question

sample.
b. could the sugar in corn syrup be sucrose? justify your conclusion.

1. a 1.0 g sample of hydrogen reacts completely with 19.0 g of fluorine to form a compound of hydrogen and fluorine.

a. what is the percent by mass of each element in the compound?
b. what mass of hydrogen would be present in a 50 g sample of this compound?
c. justify your answer to b.

Explanation:

Step1: Find total mass of compound

Total mass = mass of H + mass of F = \(1.0\,\text{g} + 19.0\,\text{g} = 20.0\,\text{g}\)

Step2: Calculate % mass of H

\(\% \text{mass of H} = \frac{\text{mass of H}}{\text{total mass}} \times 100 = \frac{1.0}{20.0} \times 100 = 5.0\%\)

Step3: Calculate % mass of F

\(\% \text{mass of F} = \frac{\text{mass of F}}{\text{total mass}} \times 100 = \frac{19.0}{20.0} \times 100 = 95.0\%\)

Step4: Find mass of H in 50g compound

Mass of H = \(\% \text{mass of H} \times \text{total mass of sample} = 0.05 \times 50\,\text{g} = 2.5\,\text{g}\)

Step5: Justify (Law of Definite Proportions)

The compound has a fixed % composition (5% H, 95% F) by mass. So, in any mass of the compound, the mass of H is 5% of the total mass. For 50g, \(5\% \times 50 = 2.5\,\text{g}\), consistent with definite proportions.

Answer:

a. Percent by mass: Hydrogen \(5.0\%\), Fluorine \(95.0\%\)
b. Mass of hydrogen in 50g sample: \(2.5\,\text{g}\)
c. Justified by the Law of Definite Proportions (fixed % composition).