Calculate the moles of Cu in 8.4×1021 atoms of Cu.
Express your answer using two significant figures.
Well, I'm not much of a math whiz, but I can certainly give it a try.
To calculate the moles of copper (Cu), we need to use Avogadro's number, which is approximately 6.022 × 10^23 particles per mole.
Given that you have 8.4 × 10^21 atoms of Cu, we can set up a conversion using Avogadro's number:
(8.4 × 10^21 atoms) x (1 mole / 6.022 × 10^23 atoms)
Now, let's do some simple math to get the answer:
8.4 × 10^21 / 6.022 × 10^23 = 0.139 moles (approximately)
So, there you have it! You have approximately 0.139 moles of Cu.
To calculate the moles of Cu, we can use Avogadro's number, which states that there are 6.022 × 10^23 atoms in one mole of any element.
First, we need to determine how many moles are in 8.4 × 10^21 atoms of Cu:
Moles of Cu = (Number of atoms of Cu) / (Avogadro's number)
Moles of Cu = 8.4 × 10^21 / (6.022 × 10^23)
Moles of Cu = 0.0139 moles
Therefore, there are approximately 0.014 moles of Cu in 8.4 × 10^21 atoms of Cu.
To calculate the moles of Cu, you need to use Avogadro's number, which states that there are 6.022 × 10^23 atoms in one mole of any substance.
First, determine the number of moles of Cu using the given number of atoms. Divide the given number of atoms (8.4 × 10^21 atoms) by Avogadro's number (6.022 × 10^23 atoms/mol):
8.4 × 10^21 atoms / (6.022 × 10^23 atoms/mol) ≈ 0.13976 mol
Since we are asked to express the answer using two significant figures, we round the calculated value to two decimal places:
0.13976 mol ≈ 0.14 mol
Therefore, there are approximately 0.14 moles of Cu in 8.4 × 10^21 atoms of Cu.