Chemistry Answers

Give spectroscopic notation for an electron within n=3 and L=1

250mL of a solution of HNO3 0.02mol/L are mixed with 150mL of a solution 

of NaOH 0.1mol/L. 

1. Write the equation of the reaction. 

2. Calculate the pH of the final mixture.

175mL of water are added to 25 mL of a solution of HCl that pH =2.1. 

Determine the new value of the pH.

Solution A: 200mL of KOH 0.025mol/L 

Solution B: 300mL of NaOH 0.001mol/L 

1. Which solution is more basic? 

2. Calculate the pH of the mixrure (A + B)

96.3 g of potassium iodate (KIO₃) is used to prepare 300.0 mL of solution. What is the molar concentration of the solution?

Compare the amount of ATP that can be obtained from palmitic and palmitoleic acids. Show solutions.

What can be concluded from this answer.

One of the properties of limestone is that it reacts with acids.

(i) Why do farmers spread powdered limestone on their fields?

(ii) How can buildings made of limestone be affected by ‘acid rain’?

(iii) Write an ionic equation which would represent the reactions taking place in both

(i) and (ii).

An analysis of seven aspirins tablets from a population known to have a standard deviation of 5,gives the following results in my aspirins per tablet:

246, 249, 255, 251, 251, 247, 250

What is the 95% confidence interval for the population's expected mean?

B. Calculate the mass in grams of each of the following samples.

a.1.50x10¹⁸ atoms Ne

b.8.35x10^{21 mole3cules CH}₄

1. What is the percent composition of the following compounds?

a.Naphtalene(C₁₀ H₈)

b Sucrose (C¹² H²² O¹¹)

c Aluminom sulfate (Al₂SO₄)₃

DIRECTIONS: Solve the following.

1. Determine the number of atoms in 1.75 mol Al

2. Calculate the number of formula units in 25.0 mol NaNO3

3. Given 6.25 mol H O2 determine the number of molecules.