if 23grams of CaO reacts with excess nh4ci what volume of NH3 gas will be produced at STP? CA Oh 2 + 2 + nh4c = 2 NH3 + H2O + cacl2 ​

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

When the volume and number of particles of a gas are constant which of the following is also constant

Substance x has a fixed volume, and the attraction between its particles is strong .substance y had widely spread out particles and can be compressed what can most likely be concluded about these substances