After the big bang, which two elements were formed and became the "building blocks" for all other elements and molecules?

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

What is the molar mass of potassium nitrate, kno3

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space