How many mol of PCl5 are in 0.17 g of PCl5?
2.56 × 10–3 mol of PCl5
3.81 × 100 mol of PCl5
3.54 × 101 mol of PCl5
8.16 × 10–4 mol of PCl5
the second one?
3.54 x 10¹ mol of PCl5
Well, let's do some math together! If we have 0.17 g of PCl5, we need to convert that to moles. To do that, we'll need the molar mass of PCl5. Do you know the molar mass of PCl5, or should I be the one to calculate it for you?
To find the number of moles of PCl5 in 0.17 grams, you need to use the molar mass of PCl5. The molar mass is the sum of the atomic masses of each element in the compound.
The molar mass of PCl5 is calculated as follows:
1 phosphorus atom (P) with an atomic mass of 31.0 grams/mole
5 chlorine atoms (Cl) with an atomic mass of 35.5 grams/mole each
So, the molar mass of PCl5 is:
(1 * 31.0) + (5 * 35.5) = 208.5 grams/mole
Now, you can use the molar mass to convert from grams to moles using the formula:
moles = mass (in grams) / molar mass (in grams/mole)
For 0.17 grams of PCl5:
moles = 0.17 g / 208.5 g/mole
Using a calculator, you'll get approximately 8.16 × 10^(-4) mol of PCl5.
Therefore, the correct answer is 8.16 × 10^(-4) mol of PCl5.
moles = grams/molar mass
No, not #2. You're guessing.
You're still guessing. What is the molar mass of PCl5?
mols = grams/molar mass PCl5 = 0.17/molar mass PCl5 = ?
Use your calculator. Stop guessing. I suppose you realize that you have guessed twice and you have only two choices left. The next guess will tell you the correct answer. Let me see your work along with you answer.