Given that H(g) + H(g) H2(g) ∆H°= -436.4 kJ/mol
Calculate the change in mass (in kg) per mole of H2 formed

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

What is the mass of oxygen gas is consumed in a reaction that produces 4.60mol so2

If a simple machine aduces the strength of a force, what must be increased? the speed of the input force the work the simple machine performs the size of the simple machine the distance over which the force is applied