Please help An electrical device has a resistance of 60 Ω and requires a current of 0.15 A to work properly. How many 1.5 V cells does the device require?

The density of an unknown gas at 98°c and 740 mmhg is 2.50 g/l. what is the molar mass of the gas with work showed?

According to the diagram; a) identify the anode of the cell and write the half-reaction that occurs there b) write the overall equation for the reaction that occurs as the cell operates c) calculate the value of the standard cell potential ,e cell. d)write the shorthand notation of the cell above e)indicate the flow of the electrons on the diagram

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.