[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.)

A company rents virtual machines, storage, and networking resources from a cloud provider. The company installs and manages its own operating systems and applications. Which cloud service model is being used, and what is one advantage of this model?

An employee accidentally shares a cloud database snapshot containing customer information. The snapshot is encrypted and unusable to unauthorized users. Which security control reduced the impact?

A customer is charged only for the resources actually consumed.

A video streaming company distributes user requests among multiple newly added servers to prevent system overload during a major sporting event. Which scaling approach is being used?

An online shopping website experiences a huge increase in visitors during a holiday sale. To handle the extra traffic, the cloud provider automatically adds five more servers. What type of scaling is being used?