Question

students conduct an experiment in which steel wool is burned in a closed test tube. this steel wool reacts with an amount of oxygen equal to 1.43% of the mass of the steel wool. what is the correct value for the missing mass in the table? a 0.71 g b 42.78 g c 43.49 g d 43.70 g

Explanation:

Step1: Calculate oxygen mass

Oxygen mass = 1.43% × steel wool mass
$0.0143 \times 0.70 = 0.01001\ \text{g}$

Step2: Find total mass after burning

Total mass = original total mass + oxygen mass
$43.48 + 0.01001 \approx 43.49\ \text{g}$

Answer:

C. 43.49 g