Calculate the number of molecules in 4.0 mol h2o.
a. 0.60 ´ 1023 molecules
c. 2.4 ´ 10–23 molecules
b. 2.4 ´ 1024 molecules
d. 2.4 ´ 1023 molecules

Achemist who studies water samples did a demonstration of how to test for lead in water. she added a clear solution of potassium iodide to a clear solution of lead nitrate. then a yellow swirling solid formed in the liquid. what is most likely true about the yellow solid?