1)What number of atoms of phosphorus are present in 1.43 g of each of the compounds listed?
(angel) P4O6
(beer) Ca3(PO4)2
(coffee) Na2HPO4
2)Silver sulfadiazine burn-treating cream creates a barrier against bacterial invasion and releases antimicrobial agents directly into the wound. If 23.0 g of Ag2O is reacted with 46.0 g of C10H10N4SO2, what mass of silver sulfadiazine, AgC10H9N4SO2, can be produced, assuming 100% yield?
3)Chloral hydrate (C2H3Cl3O2) is a drug formerly used as a sedative and hypnotic. It is the compound used to make "Mickey Finns" in detective stories.
What number of chlorine atoms are in 5.7 g chloral hydrate?
4)Hydrogen peroxide is used as a cleaning agent in the treatment of cuts and abrasions for several reasons. It is an oxidizing agent that can directly kill many microorganisms; it decomposes upon contact with blood, releasing elemental oxygen gas (which inhibits the growth of anaerobic microorganisms); and it foams upon contact with blood, which provides a cleansing action. In the laboratory, small quantities of hydrogen peroxide can be prepared by the action of an acid on an alkaline earth metal peroxide, such as barium peroxide.
BaO2(s) + 2 HCl(aq) H2O2(aq) + BaCl2(aq)
What mass of hydrogen peroxide should result when 1.35 g of barium peroxide is treated with 25 mL of hydrochloric acid solution containing 0.0275 g of HCl per mL?
What mass of which reagent is left unreacted?
5)Consider the following unbalanced reaction.
P4(s) + F2(g) PF3(g)
What mass of F2 is needed to produce 168 g of PF3 if the reaction has a 76.3% yield?
6)Commercial brass, an alloy of Zn and Cu, reacts with hydrochloric acid as follows.
Zn(s) + 2 HCl(aq) ZnCl2(aq) + H2(g)
(Cu does not react with HCl.) When 0.5029 g of a certain brass alloy is reacted with excess HCl, 0.0901 g ZnCl2 is eventually isolated.
(angel)
What is the composition of the brass by mass?
%Zn
%Cu
How could this result be checked without changing the above procedure?
7)Nitric acid is produced commercially by the Ostwald process, represented by the following equations.
4 NH3(g) + 5 O2(g) 4 NO(g) + 6 H2O(g)
2 NO(g) + O2(g) 2 NO2(g)
3 NO2(g) + H2O(heart) 2 HNO3(aq) + NO(g)
What mass in kg of NH3 must be used to produce 5.0 * 10^6 kg HNO3 by the Ostwald process, assuming 100% yield in each reaction?
please help im so lost on all of these