noawilliams10
Answered

Welcome to Westonci.ca, the place where your questions are answered by a community of knowledgeable contributors. Experience the convenience of finding accurate answers to your questions from knowledgeable experts on our platform. Get precise and detailed answers to your questions from a knowledgeable community of experts on our Q&A platform.

After 0.6 g of CoCl2 x 6H20 is heated, the residue has a mass of 0.339 g. Calculate the % H2O in the hydrate. What was the actual number of moles of water per formula unit CoCl2?

Sagot :

a.) 0.6g-0.339g=0.261g

(0.261g / 0.6g) x 100%= 43.5%

b.) (1 mol CoCl2 / 129.83 g) x (6.022 x 10^23 / 1 mol CoCl2)= 4.638 x 10^21

Part a.) uses knowledge about percent recovery and part b.) uses knowledge of converting 1 mol of a substance to formula units

Eduard22sly

A. The percentage of water, H₂O in the hydrate is 43.5%

B. The actual number of mole of water per formula unit CoCl₂ is 6 moles

A. How to determine the percentage of water

From the question given above, the following data were obtained:

  • Mass of hydrate, CoCl₂•xH₂O = 0.6 g
  • Mass of anhydrous, CoCl₂ = 0.339 g
  • Mass of water = 0.6 – 0.339 = 0.261 g
  • Percentage of water =?

Percentage of water = (mass of H₂O / mass of CoCl₂•xH₂O) × 100

Percentage of water = (0.261 / 0.6) × 100

Percentage of water = 43.5%

B. How to determine the mole of water per formula unit

To obtain the mole of water per formula unit CoCl₂, we shall determine the formula of the hydrate. This can be obtained as follow:

  • Percentage of H₂O = 43.5%
  • Percentage of CoCl₂ = 100 – 43.5 = 56.5
  • Formula =?

Divide by their molar mass

CoCl₂ = 56.5 / 130 = 0.4

H₂O = 43.5 / 18 = 2.4

Divide by the smallest

CoCl₂ = 0.4 / 0.4 = 1

H₂O = 2.4 / 0.4 = 6

Thus, the formula of the hydrate is CoCl₂•6H₂O

Therefore, the mole of water per formula unit CoCl₂ is 6 moles

Learn more about mass composition:

https://brainly.com/question/11617445

We hope our answers were useful. Return anytime for more information and answers to any other questions you have. Thank you for visiting. Our goal is to provide the most accurate answers for all your informational needs. Come back soon. Thank you for visiting Westonci.ca. Stay informed by coming back for more detailed answers.