Calculate the number of atoms of h in 22.5g of h2o

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

Agas can holds 2.0 gal of gasoline. what is this quantity in cubic centimeters?

How have the greenhouse gasses increased from the year 2000 to 2018