How many grams of nitrogen are in a mass of ammonium carbonate that contains 1.23 x 10^23 carbon atoms?

What is the percentage by mass of silicon (si) in iron aluminum silicate (fe3al2(sio4)3)?

Water is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. which change of state has most likely taken place? from a gas to a liquid from a liquid to a gas from a solid to a liquid from a gas to a plasma

One student said that the investigation was not valid (a fair test). write a plan for the investigation that includes improvements to the method and apparatus