How many moles of Csl must be dissolved into 800 ml of a 0.40 M
solution?

0.32 moles  of Csl must be dissolved into 800 ml of a 0.40 M  solution.

Explanation:

Data given:

volume of the Csl solution = 800 ml or 0.8 litres

molarity of the solution = 0.40 M

number of moles of Csl = ?

molarity is calculated by using the formula:

molarity =

rearranging the equation to get the number of moles:

number of moles = molarity x volume in litres

putting the values in the equation:

number of moles = 0.4 x 0.8

number of moles of Csl in the solution is 0.32

therefore 0.32 moles of Csl should be dissolved in 800 ml of the solution to obtain molarity of 0.4 M.

It is both accurate and precise.

Explanation:

Precision and accuracy are two different terms used to describe data or measurements. Accuracy refers to how close a set of measurements/experimental values is to an accepted or correct value while Precision refers to how close a series of experimental values are to one another.

In the given set of data in the question below, the Correct Value is 59.2 while the experimental values are as follows;

Trial 1: 58.7

Trial 2: 59.3

Trial 3: 60.0

Trial 4: 58.9

Trial 5: 59.2

Based on comparison, it can be observed that these experimental values are close to the correct value (59.2). Hence, they are said to be ACCURATE. Also, the experimental values are close to one another, hence, they are said to be PRECISE.

Therefore, the data set is both accurate and precise.