If g of aspirin (C9H8O4) are produced from 79.8 g of C7H6O3, what is the percent yield from the reaction below? C7H6O3 (s) + C4H6O3 (s) → C9H8O4 (s) + HC2H3O2 (aq) (C9H8O4 = 180.17 g/mol and C7H6O3 = 138.13 g/mol)

The pH of an unknown solution is 9.5. Its is:

Consider the Haber-Bosch process for the synthesis of ammonia from its elements. Calculate the theoretical yield in moles NH3 from the complete reaction of grams N2 in the presence of excess H2 gas according to the following balanced chemical equation: N2(g) + 3 H2(g) → 2 NH3(g)

What is the mass, in grams, of × 1021 silicon atoms?

A chemist carries out this reaction in the laboratory using 4.31 grams of zinc and an excess of sulfur:    Zn + S → ZnS From the balanced equation, she calculates that she should obtain 6.41 grams of zinc sulfide. However, she isolates only grams of product. What is her percent yield for this reaction?

What is the correct name for P4O10?  

What is the access modifier that allows a class or method to be accessed from anywhere in the same package, but not from outside the package?

Which method is automatically called when an object is created in Java, and it is responsible for initializing the object’s variables?

Match each of the the three horizontal/lateral gene transfer processes with its requirements.

Due to low vaccination rates, outbreaks of whooping cough caused by                                    continue to occur in various places in the United States.  Because infants, who cannot be vaccinated and for whom the disease can be fatal, most frequently contract the disease from their caregivers (eg., parents), caregivers are advised to update their own vaccination status.