General Chemistry Answers

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)

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.

3Mg + Fe2O3 > 3Ngo + 2Fe

1what is the limiting reactant for this reaction

2 what is the theoretical yield of MgO that can be produced

CO + 2H2 > CH3OH

1 What is the theoretical yield of methanol

2 What is the percentage yield of methanol

KMnO4 + H2C2O4 + H2SO4 >CO2 + K2SO4 + MnSO4 + H2O

3 The oxidizing agent is

4 In a redox reaction the oxidizing agent always

1 what is the percent by mass of oxygen in magnesium oxide , MgO

2 A compound is approximately 86% carbon and 14 % hydrogen by mass. What is the empirical formula for this compound

3 100g of eucalyptol, the chief constituent of eucalyptus oil, consist of 6.484 mol C 11.67 lol H, and 0.6481 mol O

What is the empirical formula of this compound.

4 how many millimetres of 3.0 M H2SO4 are needed to make 450 mL of 0.10 MH2SO4

5 how many moles of HCl are there in 15.0 mo2 of solution with a concentration of 2.50 mol-1

6 If I prepare a solution by adding 75 mL of 1.25 M HCl into a 250 mL volumetric flask, and filling the flask to the mark with water , What will the final concentration of the solution be

7 what is the molarity of glacial acetic acid ( CH3COOH, Mr =60.05 g/mL ) at 25 degrees Celsius given that the density of acetic acid at that temperature is 1.049 g/mL

8 what is the molarity of a KF (aq) solution containing 116.2 g of KF in 3.00 L of solution