Which of the following has the highest mass? A. 50.0g water
B. 50.0 moles of oxygen
C. 50.0 molecules carbon dioxide
D. 50.0 mol NaCl

1 a

2 d

3 a

4 c

explanation:

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

c. 4.54 x 10–12 j happens to be correct