Back
Problem 154
What are the formulas of the compounds formed from the following ions? (a) Ca2+ and Br- (b) Ca2+ and SO42- (c) Al3+ and SO42-
- What are the formulas of the compounds formed from the following ions? (a) Na+ and NO3- (b) K+ and SO42- (c) Sr2+ and Cl-
Problem 155
- What are the charges on the positive ions in the following compounds? (a) Zn(CN)2 (b) Fe(NO2)3 (c) Ti(SO4)2 (d) Sn3(PO4)2 (e) Hg2S (f) MnO2 (g) KIO (h) Cu(CH3CO2)2
Problem 159
- Ammonia (NH3) and hydrazine (N2H4) are both compounds of nitrogen and hydrogen. Based on the law of multiple pro-portions, how many grams of hydrogen would you expect 2.34 g of nitrogen to combine with to yield ammonia? To yield hydrazine?
Problem 166
- If 3.670 g of nitrogen combines with 0.5275 g of hydrogen to yield compound X, how many grams of nitrogen would combine with 1.575 g of hydrogen to make the same compound? Is X ammonia (NH3) or hydrazine (N2H4)?
Problem 167
- Prior to 1961, the atomic mass unit (amu) was defined as 1/16 the mass of the atomic weight of oxygen; that is, the atomic weight of oxygen was defined as exactly 16. What was the mass of a 12C atom prior to 1961 if the atomic weight of oxygen on today's scale is 15.9994?
Problem 168
- What was the mass in atomic mass units of a 40Ca atom prior to 1961 if its mass on today’s scale is 39.9626? (See Problem 2.168.)
Problem 169
- The molecular weight of a compound is the sum of the atomic masses of all atoms in the molecule. What is the molecular mass of acetaminophen (C8H9NO2), the active ingredient in Tylenol?
Problem 170
Problem 172a
In an alternate universe, the smallest negatively charged particle, analogous to our electron, is called a blorvek. To determine the charge on a single blorvek, an experiment like Millikan's with charged oil droplets was carried out, and the following results were recorded : (a) Based on these observations, what is the largest possible value for the charge on a blorvek?
Problem 172b
In an alternate universe, the smallest negatively charged particle, analogous to our electron, is called a blorvek. To determine the charge on a single blorvek, an experiment like Millikan's with charged oil droplets was carried out, and the following results were recorded : (b) Further experiments found a droplet with a charge of 5.81 * 10-16 C. Does this new result change your answer to part (a)? If so, what is the new largest value for the blorvek's charge?