How do I calculate number of moles of K2C2O4 in 20mL of a saturated (300g K2C2O4.H2O per liter) solution....

Well, to calculate the number of moles of K2C2O4 in a solution, you'll need to use some good old chemistry humor. Ready?

First, let's break it down. K2C2O4 is potassium oxalate, and we want to find the number of moles in 20 mL of a saturated solution.

Now, to the calculation. With a saturated solution, there is a fixed amount of solute that can dissolve, regardless of the amount of solvent (in this case, water). We know that the saturated solution contains 300 grams of K2C2O4.H2O per liter.

So, step one: convert the given volume from mL to L. There are 1000 mL in a liter, so 20 mL is 0.02 L.

Step two: calculate the number of moles using the formula:

moles = mass / molar mass

The molar mass of K2C2O4.H2O is approximately 194.2 g/mol.

Now, you can use the given mass of K2C2O4.H2O (300 g per liter) and the volume in liters (0.02 L) to find the number of moles.

But hey, here's a joke to lighten things up: Why did the scarecrow win an award? Because he was outstanding in his field!

Back to the task at hand, plug the values into the formula, and you'll get the number of moles of K2C2O4 in 20 mL. Remember, it's all about using the right formulas, and making sure you have a "mole-ment" of laughter along the way!

To calculate the number of moles of K2C2O4 in the given solution, we need to follow these steps:

Step 1: Determine the molar mass of K2C2O4.
Step 2: Convert the given mass concentration to moles per liter.
Step 3: Convert the volume to liters.
Step 4: Calculate the number of moles.

Let's go through each step:

Step 1: Determine the molar mass of K2C2O4.
The molar mass of K2C2O4 can be calculated by summing the atomic masses of all the elements in the compound:
Molar mass of K2C2O4 = (2 x atomic mass of K) + (2 x atomic mass of C) + (4 x atomic mass of O)
= (2 x 39.10 g/mol K) + (2 x 12.01 g/mol C) + (4 x 16.00 g/mol O)
= 166.22 g/mol

Step 2: Convert the given mass concentration to moles per liter.
The given mass concentration is 300 g K2C2O4.H2O per liter.
However, the molecular weight provided above does not account for the water of hydration. To convert the mass concentration, we need to consider the molar mass of K2C2O4.H2O, which includes the water molecules.

The molar mass of K2C2O4.H2O is the sum of the molar mass of K2C2O4 and one mole of water (H2O):
Molar mass of K2C2O4.H2O = 166.22 g/mol + 18.015 g/mol
≈ 184.23 g/mol

Now, we can convert the given concentration to moles per liter:
Moles of K2C2O4.H2O = mass concentration / molar mass of K2C2O4.H2O
= 300 g/L / 184.23 g/mol
≈ 1.63 mol/L

Step 3: Convert the volume to liters.
The volume is given as 20 mL. To convert this to liters, we divide by 1000 since there are 1000 mL in one liter:
Volume = 20 mL / 1000 mL/L
= 0.02 L

Step 4: Calculate the number of moles.
To calculate the number of moles in the given volume, we multiply the concentration in moles per liter by the volume in liters:
Number of moles = Moles of K2C2O4.H2O x Volume
= 1.63 mol/L x 0.02 L
≈ 0.0326 moles

Therefore, there are approximately 0.0326 moles of K2C2O4 in 20 mL of the saturated solution.

To calculate the number of moles of K2C2O4 in a given volume of a saturated solution, you need to follow these steps:

Step 1: Determine the molarity of the saturated solution.
The molarity (M) of a solution is defined as the number of moles of solute per liter of solution. In this case, the information given is the mass of K2C2O4.H2O per liter of solution. To find the molarity, you need to convert the mass to moles.

The molecular weight of K2C2O4.H2O can be calculated as follows:
K: 39.10 g/mol (2 atoms) = 78.20 g/mol
C: 12.01 g/mol (2 atoms) = 24.02 g/mol
O: 16.00 g/mol (4 atoms) = 64.00 g/mol
H: 1.01 g/mol (2 atoms) = 2.02 g/mol

By adding these values together, the molecular weight of K2C2O4.H2O is found to be 172.24 g/mol.

The concentration of the saturated solution is given as 300 g/L, which is equivalent to 300/172.24 moles per liter. Therefore, the molarity of the saturated solution is 1.74 M.

Step 2: Convert the volume of the solution from milliliters to liters.
The given volume is 20 mL. To convert this to liters, divide 20 mL by 1000 (since there are 1000 mL in a liter):
20 mL ÷ 1000 = 0.02 L

Step 3: Calculate the number of moles using the molarity and volume.
Applying the formula for moles (moles = molarity x volume), we can substitute the values:
Moles = 1.74 M x 0.02 L = 0.0348 moles

Therefore, there are 0.0348 moles of K2C2O4 in 20 mL of the saturated solution.

The 20 ml will contain

G = 20 ml x 300 g/1000 ml of the K2C2O4.

Calculate the molecular mass of K2C2O4 (M).

The number of moles is then G/M