Cu có hai đồng vị là 63cu và 65cu biết rằng M cu = 63.54. Nếu như có 500 nguyên tử Cu thì trong đó có bao nhiêu nguyên tử là 63 Cu

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Asolution contains 180 g of glucose (c6h12o6) and 162 g of water. what is the mole fraction of glucose?

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