Question

A person drinks 1900 g of water, H₂O, per day. How many moles of water did they consume?

A) 3.4 x 10⁴ mol
B) 0.009 mol
C) 105 mol
D) 18.02 mol

Answer 1

The person who drank 1900 g of water consumed approximately 105 moles of water, as the molar mass of water is 18.015 g/mol and the mass was divided by the molar mass to determine the number of moles.

Step-by-step explanation:

To calculate how many moles of water were consumed by a person drinking 1900 g of H₂O, you would use the molar mass of water as a conversion factor. The molar mass of water is 18.015 g/mol, as determined by the atomic weights of hydrogen and oxygen (2x1.008 g/mol for H and 15.999 g/mol for O, so 2x1.008 + 15.999 = 18.015 g/mol). Therefore, you would divide the mass of water consumed by the molar mass of water to find the number of moles:

Number of moles (n) = mass (m) / molar mass (M)

n = 1900 g / 18.015 g/mol

n ≈ 105 mol

So, the person consumed approximately 105 moles of water, which corresponds to option C.