if a scientist needed 4.2 moles of silicon dioxide for the chemical reaction, how many grams does that scientist need

Which statement describes how phase changes can be diagrammed as a substance is heated? the phase is on the y-axis and the temperature is on the x-axis. the temperature is on the y-axis and the phase is on the x-axis. the time is on the y-axis and the temperature is on the x-axis. the temperature is on the y-axis and the time is on the x-axis.

What is the number of neutrons in an atom with atomic mass of 35

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?