The combustion of c2h4(g) is represented by the equation above. (a) use the enthalpies of formation in the table below to calculate the value of δh∘1 for the reaction.

What is avogadro’s number, and why is it useful

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?

How many neutrons does an element have if its atomic number is 50 and its mass number is 166