you are given a solid that is a mixture of na2s04 and k2s04. A 0.215g sample of the mixture is dissolved in water. An excess of an aqueous solution of bacl2 is added. The bas04 that is formed is filtered, dried and weighed. Its mass is 0.299g. What mass of s04 ion is in the sample

My calculation 0.299/233g/mol = 0.00128 x 96 g/mol = 0.123g
What is the mass percent of s04 in the sample 0.213g/ 0.215g x 100 = 57.2%
what are the percent composition by mass of na2s04 and k2s04 in the sample
I cannot solve this part
na2s04 16.9%
k2s04 83.1%

Damon step by step for me Thank you a lot

First go back and see my change to the earlier problem I did percent of moles and it should be percent of grams. You had the correct answer, 60%

I can not do another one right now.

Hey, this looks just like the last problem with new numbers. If you learn how to do the last one, you can do this one.

I agree with Damon. Look how I did NaCl and KCl mixture above.

To find the mass percent of Na2SO4 and K2SO4 in the sample, you can follow these steps:

Step 1: Calculate the moles of BaSO4 formed
We know that the mass of BaSO4 formed is 0.299 g. Using the molar mass of BaSO4 which is 233 g/mol, we can calculate the number of moles of BaSO4 formed:
Moles of BaSO4 = mass of BaSO4 / molar mass of BaSO4
= 0.299 g / 233 g/mol
= 0.001282 moles

Step 2: Calculate the moles of SO4 in BaSO4
In BaSO4, the ratio of Ba to SO4 is 1:1. This means that the number of moles of SO4 in BaSO4 is also 0.001282 moles.

Step 3: Convert moles of SO4 to mass
Now, we need to calculate the mass of SO4 in the sample. To do this, we'll use the molar mass of SO4, which is 96 g/mol:
Mass of SO4 = moles of SO4 × molar mass of SO4
= 0.001282 moles × 96 g/mol
= 0.123072 g (approximately 0.123 g)

Step 4: Calculate the mass percent of SO4 in the sample
To find the mass percent of SO4 in the sample, we'll divide the mass of SO4 by the mass of the sample, then multiply by 100:
Mass percent of SO4 = (mass of SO4 / mass of sample) × 100
= (0.123 g / 0.215 g) × 100
≈ 57.21%

Step 5: Calculate the mass percent of Na2SO4 and K2SO4
Since Na2SO4 and K2SO4 have a 1:1 ratio with SO4, their mass percent in the sample will also be 57.21%.

So, the mass percent composition of Na2SO4 and K2SO4 in the sample is approximately:
Na2SO4: 57.21%
K2SO4: 57.21%

Note: It's important to note that the mass percent composition can only be calculated assuming that the sample contains only Na2SO4 and K2SO4 and no other compounds. In reality, there could be impurities or other compounds in the sample, which might affect the composition.