How to Calculate the Number of Moles in a Substance
How many moles of CaCO3 are there in 2.50*10^24 molecules of CaCO3?
A. 4.16 × 10^7 moles
B. 2.50 × 10^24 moles
C. 7.81 × 10^15 moles
D. 5.02 × 10^20 moles
Answer:
The correct answer is A. 4.16 × 10^7 moles.
To calculate the number of moles in a substance, you can use the formula:
moles = no of molecules ÷ Avogadro's number
Given that there are 2.50 × 10^24 molecules of CaCO3, you can calculate the number of moles as follows:
moles = 2.50 × 10^24 ÷ 6.02 × 10^23
moles ≈ 4.16 × 10^7
Therefore, there are approximately 4.16 × 10^7 moles of CaCO3 in 2.50 × 10^24 molecules of CaCO3.