Question 3.Why is the atomic mass of carbon not a whole number as listed in the periodic table?*
O A. Because Carbon-14 is used to date fossils.
B. The most stable artificial radioisotope is carbon-11.
C. Because carbon needs 4 extra electrons to complete its valence shell.
D. Because it is the weighted average of the three naturally-occurring isotopes of
carbon

The lattice enthalpy (formation of ionic solid from ions in the gas phase) for agcl(s) is -916 kj/mol and the hydration enthalpy (dissolution of gaseous ions into water) is -850 kj/mol. how much heat (in joules) is involved in forming 1l of saturated agcl solution (1.8 × 10-4 g / 100 ml water) by dissolving agcl(s)? assume solution volume does not change much upon dissolution. the equations are given below. ag+(g) + cl−(g) æ agcl(s)