The reaction PCl5+4 H₂O 5 HCl + H₂PO4, how many molecules of PCI5 are required to react
completely with 18 grams of water?

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

The chemical formula for emerald is be3al2(sio3)6.an emerald can be decided as

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control?