A concave mirror of focal length 20 cm forms an image twice the size of the object. For the virtual position of the object, the position of the object will be at:
(a) 25 cm
(b) 40 cm
(c) -10 cm
(d) At infinity

There are 10 moles of copper(II)sulfate.

Explanation:

We know that molarity is a concentration measure that expresses the moles of solute per liter of solution: in this case, being 1.30 molar, there are 1.30 moles of solute in 1 liter of solution. We solve with the following simple rule of three:

1 L solution2 moles of copper(II)sulfate

5 L solutionx= (5 L solution x 2 moles of copper(II)sulfate)/1 L solution

x= 10 moles of copper(II)sulfate