jason Simmons posted Jun 23, 2021 11:06 AMSubscribePlease comment on these problems.100. For each

jason Simmons posted Jun 23, 2021 11:06 AMSubscribePlease comment on these problems.

100. For each of the following pairs of ions, write the symbol for the formula of the compound they will form:
(a) K , O2− (K2O)
(b) NH4 , PO4 3− ((NH4)3PO4)
(c) Al3 , O2− ( Al2O3)
(d) Na , CO3 2− (Na2CO3)
e) Ba2 , PO4 3− (Ba3(PO4)2)
In order for each pair to combine, the charge needs to balance. 
53. A cough syrup contains 5.0% ethyl alcohol, C2H5OH, by mass. If the density of the solution is 0.9928 g/mL, determine the molarity of the alcohol in the cough syrup
Volume =(0.9928g/ml)(1000ml)=992.8g
mass of alcohol=0.05 (992.8g)=49.64g
number of moles =49.64g/46 g/mol= 1.08moles
molarity = 1.08m/1L= 1.08moles