How many moles are in 84.23 g of ZnCl 2 ?

Please help

To save time, you can approximate the initial mass of the solid to the nearest ±1 g. for example, if you are asked to add 14.3 g of copper, add between 13 g and 15 g. which of the following sets include two samples with an equal density? which all that apply below 15.4 g gold and 18.7 g silver 15.2 g copper and 50.0 g copper 20.2 g silver and 20.2 g copper 11.2 g gold and 14.9 g gold

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

What produces wave a)sound b) heats c)transfer of energy d)vibrations