Answer:
A mixture of salt and sugar can be separated by the process of filtration.
<u>Solu</u><u>tion</u><u> </u><u>:</u><u>-</u>
First of all for comparing any two quantities , they must be in same units .
Here one unit is in grams and other in milligrams .
So let's convert gram to miligram .
We know that 1 gram = 1000 mg.
So , 0.7g = 0.7 × 1000 mg = 700mg .
Clearly 711mg > 700mg .
Hence 711mg is Greater than 0.7 g .
Answer:
Percent yield = 22.8 %
Explanation:
Step 1: Data given
Numbers of moles copper = 0.0970 moles
Mass of copper(I) sulfide = 1.76 grams
Step 2: The balanced equation
2Cu + S ⇒ Cu2S
Step 3: Calculate moles of Cu2S
For 2 moles Cu we need 1 mol S to produce 1 mol Cu2S
For 0.0970 moles Cu we'll hace 0.0970 / 2 = 0.0485 moles
Step 4: Calculate mass of Cu2S
Mass Cu2s = moles Cu2S * molar mass Cu2S
Mass Cu2S = 0.0485 moles * 159.16 g/mol
Mass Cu2S = 7.72 grams
Step 5: Calculate percent yield
Percent yield = (actual yield/ theoretical mass) * 100%
Percent yield = (1.76 grams / 7.72 grams)*100%
Percent yield = 22.8 %
