A university president claims more than 55% of all students regularly use the campus library. A random sample of 250 students yielded 141 who regularly use the library. Use a 5% level of significance to test the researcher’s claim.   Calculate the p-value using the appropriate table above. [a]

What volume would 12.0 grams of helium occupy at 1.7 atm of pressure and a temperature of 300 K?

A buffer solution contains a mixture of carbonic acid (H2CO3) and potassium hydrogen carbonate (KHCO3). What reaction will take place if H+ is added to this solution?

In the equilibrium shown below, which species is the conjugate acid of compound b?

A university president claims more than 55% of all students regularly use the campus library. A random sample of 250 students yielded 141 who regularly use the library. Use a 5% level of significance to test the researcher’s claim.   Calculate the value of the test statistic (round to 2 decimal places) [a]

The precipitate for the following precipitation reaction is _______. 2 NaCl(aq) + Pb(NO3)2(aq) → 

A sample containing 45.0 mol of propane gas at a temperature of 25.0 °C is stored in a 15.0 L cylinder. What is the pressure of the gas inside the cylinder? (Hint: K=°C+273)

Acids that completely ionize in water are:

The pH of an unknown solution is 8.5. What is the [OH-]?

A 50.0 mL sample of HNO3 is neutralized by reaction with 120.0 mL of 2.50 M NaOH. What is the concentration of HNO3 in the sample? (Hint: M1V1=M2V2)