How many moles of H2 are required to produce 3.5 moles of H2O?

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

How does the motion of particles in a gas change as the gas cools

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?