General Chemistry Answers

1. Why is rusting of iron is an example of spontaneous process? Explain in 2-3 sentences only.

2. Why steam has a greater entropy than ice and water? Explain briefly into 2-3 sentences only.

3. Refrigerator food stays fresh for long periods. The same food stored at room temperature quickly spoils. Why? Explain briefly with perfect explanation about the situation.

Exercise 1: Preparation of a solution An aqueous solution S1 of volume 1 L is prepared, containing 9.6 g of zinc sulfate ZnSO4.Given: M (Zn) = 65 g / mol; M (S) = 32 g / mol; M (O) = 16 g / mol; Zinc ions: Zn2 +; Sulphate ions: SO42-

The decomposition of N2O5 from the equation below

2N2O5 ----> 4NO2 + O2 has a rate of law of 1×10–³s-¹.

What is the rate of reaction when the concentration of

N2O5 is 0.0001mol/L.

The conversion of cyclopropane to propene in the gas phase is a first order reaction with a constant rate of 6.7×10²⁴s-¹ at 500°C.

A. If the initial concentration of cyclopropane was 0.25M, what is the concentration after 8.8 min?

B. How long (in minutes) will it take for the concentration of cyclopropane to decrease from 0.25 M to 0.15 M?

C. How long (in minutes) will it take to convert 74 percent of the starting material?

 A container holds a mixture of gases with the following partial pressures: PO₂ = 40.3 kPa, PCO₂ = 0.89 kPa, PN₂ = 180.3 kPa, and Ptotal = 222.8 kPa. Calculate the pressure of the other gases as described by Dalton's law of partial pressures.

1 the oxidation state of the hydrogen atoms in CaH2 is

2 The oxidation number of the manganese atom in (NH4)2Mn04 I is

3 The oxidation number of phosphorus in KH2PO4 is

4 The oxidation number of the oxygen in O3 is

5 The oxidation number of p in H3PO2

6 Type of reagent is required to convert NO2- to N2 ?

7 what type of reagent is required to convert No2- to HNO2 ?

8 What is the total number of atoms contained in 2.00 of nickel?

Calculate the volume (in mL) of 19 M NaOH solution needed to make a 1.00 L solution of 0.1 M NaOH. Express your answer to two significant figures.

When CO2(g)CO2(g) is put in a sealed container at 730 KK and a pressure of 10.0 atm and is heated to 1420 KK , the pressure rises to 24.1 atm. Some of the CO2CO2 decomposes to COCO and O2O2.

Calculate the mole percent of  CO2 that decomposes.

Express your answer using two significant figures.

%CO2 =

Determine if the decomposition of potassium chlorate (KClO₃) is spontaneous or not

2KClO₃ (s) —› 2KCl(s) + 3O₂ (g)

Look for S^o of the reactant and products. Compute for the S^o of the reactant

1.  C₃H₈(g) + 5O₂(g) —› 3CO₂(g) + 4H₂O(g)