I have a word problem that is driving me crazy, I don't even know where to begin. It goes like this: "A pesticide contains thallium (I) sulfate. By reacting 10.20 grams of the pesticide with excess sodium iodide, 0.1964 grams of thallium (I) iodide is produced by the following reaction: Tl2SO4 + 2 NaI ---> 2 TlI + Na2SO4. What is the mass percent of thallium (I) sulfate in the pesticide?" If someone could help me with it or just show me how to start it off, I'd be very grateful.
Convert 0.1964 g TlI to mols TlI.
Convert mols TlI to mols Tl2SO4.
Convert mols Tl2SO4 to grams Tl2SO4.
Convert grams Tl2SO4 to percent of 10.20 g sample.
Post your work if you get stuck.
ouestion or answers
Sure, I can help you with that word problem! To find the mass percent of thallium (I) sulfate in the pesticide, we need to calculate the mass of thallium (I) sulfate and compare it to the total mass of the pesticide.
Let's break down the problem and find a step-by-step solution:
Step 1: Write down the balanced chemical equation.
Tl2SO4 + 2 NaI ---> 2 TlI + Na2SO4
Step 2: Calculate the molar mass of Tl2SO4 and TlI.
The molar mass of Tl2SO4 can be calculated as follows:
(2 x molar mass of Tl) + (1 x molar mass of S) + (4 x molar mass of O)
= (2 x 204.38 g/mol) + (1 x 32.07 g/mol) + (4 x 16.00 g/mol)
= 408.76 g/mol + 32.07 g/mol + 64.00 g/mol
= 504.83 g/mol
The molar mass of TlI is calculated as follows:
(1 x molar mass of Tl) + (1 x molar mass of I)
= (1 x 204.38 g/mol) + (1 x 126.90 g/mol)
= 204.38 g/mol + 126.90 g/mol
= 331.28 g/mol
Step 3: Calculate the number of moles of TlI produced.
To do this, we need to use the given mass of TlI and its molar mass.
Number of moles of TlI = Mass of TlI / Molar mass of TlI
= 0.1964 g / 331.28 g/mol
Step 4: Calculate the number of moles of Tl2SO4 reacted.
Since the reaction is 1:1 between Tl2SO4 and TlI, the number of moles of Tl2SO4 reacted will be the same as the number of moles of TlI.
Number of moles of Tl2SO4 = Number of moles of TlI
Step 5: Calculate the mass of Tl2SO4 using the number of moles and molar mass.
Mass of Tl2SO4 = Number of moles of Tl2SO4 x Molar mass of Tl2SO4
Step 6: Calculate the mass percent of Tl2SO4 in the pesticide.
Mass percent = (Mass of Tl2SO4 / Mass of pesticide) x 100%
By following these steps, you should be able to calculate the mass percent of thallium (I) sulfate in the pesticide.