Can someone please help me with 1-8
with explanations and work please, so Iunderstand
Can Someone Please Help Me With 1 8 With Explanations And Work Please So I Understand 1 (103.72 KiB) Viewed 34 times
A student is given a sample of red cobalt sulfate hydrate. She weighed the sample in a dry covered crucible and obtained a mass of 26.148 g for the crucible, cover, and sample. Before adding the sample, the crucible and cover weighed 24.322 g. She then heated the crucible to drive off the water of hydration, keeping the crucible at red heat for about 10 minutes with the cover slightly ajar. She then let the crucible cool, and found it had a lower mass; the crucible, cover and contents then weighed 25.329 g. In the process the sample was converted to blue anhydrous CoSO4. Show all calculations necessary to answer the following questions. 1. What was the mass of the hydrate sample? g hydrate 26.148−24.322 2. What is the mass of the anhydrous CoSO4 ? gCoSO4 3. How much water was driven off? gH2O
4. What is the percentage of water in the hydrate? % water = mass of hydrate sample mass of water in sample ×100 %H2O 5. How many grams of water would there be in 100.0 g of hydrate? How many moles? gH2O moles H2O 6. How many grams of CoSO4 are there in 100.0 g of hydrate? How many moles? What percentage of the hydrate is CoSO4 ? Convert the mass of CoSO4 to moles. The molar mass of CoSO4 is 154.996 g. gCoSO4 moles CoSO4 %CoSO4 in hydrate
7. How many moles of water are present per mole of CoSO4 ? moles H2O/ moles CoSO4 8. What is the formula of the hydrate?
Join a community of subject matter experts. Register for FREE to view solutions, replies, and use search function. Request answer by replying!