Answer:
Percent yield = 17%
Explanation:
Given data:
Actual yield of lithium chloride = 6.0 g
Theoretical yield of lithium chloride = 35.4 g
Percent yield = ?
Solution:
Formula:
Percent yield = (actual yield / theoretical yield )× 100
Now we will put the values in formula.
Percent yield = (6.0 g/ 35.4 g)× 100
Percent yield = 0.17 × 100
Percent yield = 17%
The formula of a compound is 
Given:
The ions
and 
To find:
The formula for ions
and 
Solution:
The ion with a positive charge (cation) = nickel ion = 
The ion with a negative charge (anion) = nitrate ion = 
Valency on nickel ion = 2
Valency on nitrate ion = 1
Using the criss-cross method as shown in image
The formula of a compound : 
The name of a compound is nickel(II) nitrate

The formula of a compound is 
Learn more about ions here:
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<span>A chemical reaction is required to separate the substances in a compound. The components of a mixture can be separated based on their physical properties using techniques like filtration or distillation.</span>
To find the empirical formula you would first need to find the moles of each element:
58.8g/ 12.0g = 4.9 mol C
9.9g/ 1.0g = 9.9 mol H
31.4g/ 16.0g = 1.96 O
Then you divide by the smallest number of moles of each:
4.9/1.96 = 2.5
9.9/1.96 = 6
1.96/1.96 = 1
Since there is 2.5, you find the least number that makes each moles a whole number which is 2.
So the empirical formula is C5H12O2.