Question

A lead pipe weighs 25 lbs.How many moles of lead are in the pipe?

a) 0.114 moles
b) 1,360 moles
c) 5.62 moles
d) 55 moles

Answer 1

To calculate the number of moles of lead in a lead pipe, you need to divide the weight of the pipe by the molar mass of lead. The correct answer is d) 55 moles.

Step-by-step explanation:

The question asks how many moles of lead are in a lead pipe that weighs 25 lbs. To calculate this, we need to use the molar mass of lead. The molar mass of lead is 207.2 g/mol. First, we need to convert the weight of the pipe from pounds to grams. There are 453.6 grams in a pound, so the pipe weighs 11340 grams. Next, we divide the weight by the molar mass to find the number of moles:

Number of moles = weight (g) / molar mass (g/mol)

Number of moles = 11340 g / 207.2 g/mol = 54.73 moles

Therefore, the correct answer is d) 55 moles.