Determine the name for CoCl26H2O. Remember that Co forms several ions.

How many moles of PBr3 contain 3.68 × 1025  bromine atoms?

[a] Fe(s)   +  [b] Cd(NO3)2(aq)   →  [c] Fe(NO3)3(aq)   +   [d] Cd(s)    

[a] Fe2(CO3)3(s)       →   [b] Fe2O3(s)  +   [c] CO2(g)

[a] HClO4(aq)   + [b]  Ba(OH)2(s)  →  [c] Ba(ClO4)2(s)  +  [d]  H2O(l)

[a] Co(NO3)2(aq)   +  [b] H2S(g)  →   [c] CoS(s)   +    [d] HNO3(aq)    

The outside temperature is 35°C, what is the temperature in K?

Question 2 — Limiting Reactant + Percent Yield: Aspirin Synthesis  Aspirin is synthesized by the reaction: C7H6O3 + C4H6O3 → C9H8O4 + C3H4O2(salicylic acid + acetic anhydride → aspirin + acetic acid) A student combines 14.0 g of salicylic acid (MW = 138.12 g/mol) with 10.0 g of acetic anhydride (MW = 102.09 g/mol) and isolates 14.8 g of aspirin (MW = 180.16 g/mol). Which statement is correct?

Question 4 — Limiting Reactant: Thermite Reaction  The thermite reaction: Fe2O3(s) + 2 Al(s) → Al2O3(s) + 2 Fe(l) A chemist combines 100.0 g Fe2O3 and 54.0 g Al and allows the reaction to go to completion. What is the theoretical yield of Fe and what mass of the excess reactant remains unreacted? Molar masses: Fe2O3 = 159.69 g/mol; Al = 26.98 g/mol; Fe = 55.85 g/mol Warning: On a mass basis, 100 g Fe2O3 looks like the larger quantity — convert to moles before deciding which is limiting.

If an object is accelerating at a rate of 25 m/s2, how long (in seconds) will it take to reach a speed of 550 m/s? (Assume an initial velocity of zero.)