Porassium alum is 3.9 parts per 100 parts of water. Knowing this, how many moles of potassium alum are present in 50ml?
Since 50 is 1/2 of 100, wouldn't that be 3.9/2 = ? pars alum
Then convert g alum to mols alum.
Calculate the frequency of this radiation. The wavelength is 640 nm?
To determine the number of moles of potassium alum present in 50 mL of a solution with a concentration of 3.9 parts per 100 parts of water (or 3.9%), we need to follow these steps:
Step 1: Convert the volume from mL to liters.
50 mL = 50/1000 = 0.05 L
Step 2: Calculate the concentration of potassium alum in moles per liter (molarity).
Since the concentration is given as a percentage, we need to convert it to a decimal.
3.9% = 3.9/100 = 0.039 (as a decimal)
The concentration in moles per liter (molarity) is 0.039 mol/L.
Step 3: Multiply the concentration by the volume in liters to get the number of moles.
Number of moles = concentration (mol/L) x volume (L)
Number of moles = 0.039 mol/L x 0.05 L
Calculating this:
Number of moles = 0.00195 moles
Therefore, there are 0.00195 moles of potassium alum present in 50 mL of the solution.