How does the law of conservation of mass apply to this reaction c2h4 + o2 > 2h2o + 2co2 ?
a. only the oxygen needs to be balanced
b. the equation needs to be balanced. there are fewer oxygen atoms in the equation than hydrogen and carbon
c. the law of conservation of mass has already been applied
d. each element needs to be balanced

Which of the following statements are true for an isothermal process? check all that apply. - during an isothermal process, the work done by the gas equals the heat added to the gas. - during an isothermal process, the internal energy of the system changes. - an isothermal process is carried out at constant temperature. - an isothermal process is carried out at constant pressure. - an isothermal process is carried out at constant volume.