How many moles are in a 7.40-g sample of copper?

0.11645 moles

Explanation:

moles=n

M is molar mass of substance

m is in grams

n=m/M

So, 7.40/63.546 = 0.11645

0.116(rounded to sig figs)

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

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