Calculate the grams of NaHCO3 by multiplying the moles of NaHCO3 by the molecular weight of NaHCO3 (84.007 g/mol).

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.