Questions of the Day Set #5
#50
Which of these compounds contains the highest percent by mass of carbon?
(A) CO2
(B) CaCO3
(C) Al2(CO3)3
(D) Mg(CN)2
#52
A compound contains 36.48% sodium, 25.44% sulfur, and 38.08% oxygen. What is the empirical formula?
(A) NaSO3
(B) NaSO4
(C) Na2SO3
(D) Na2SO4
#54
What is the empirical formula of a compound that consists of 16.4% magnesium, 18.9% nitrogen, and 64.7%
oxygen?
(A) MgNO3
(B) Mg(NO3)2
(C) MgNO2
(D) Mg(NO2)2
#56
What is the formula for zinc sulfate?
(A) ZnSO4
(B) Zn2SO4
(C) Zn(SO4)2
#58
Which of these compounds contains both ionic and covalent bonds?
(A) K2O
(B) CO2
(C) K2CO3
(D) Zn2(SO4)3
(D) O2
#60
How many grams are equal to 1.757 moles of calcium phosphate, Ca3(PO4)2?
(A) 545.2 g
(B) 0.005662 g
(C) 176.6 g
(D) 1.058 x 1024 g