General Chemistry Answers

An unknown compound was discovered in a laboratory by a chemist. To be able to

find out the molecular formula of this compound, 1.13 g of the unknown compound was

placed into a combustion chamber, and end of the analysis 1.252 g CO2 and 0.3404 g

H2O were obtained. Later, the chemist analyzed the molar mass of the compound as 240

g/mol. What is the molecular formula of the unknown compound?

It Describes the angular
momentum of an electron 
represented by arrows

True or false

1. An ionic compound is formed when the two oppositely charged ions attract each other.

2. The number of valence electrons of a main block element is usually equivalent to its period number.

3.Lewis dot symbols for the transition metals, tanthanides, and actinides because they all have incompletely filled inner shells.

Consider a mixture of A moles of hydrogen and B Moles of Iodine in a volume of Vdm³ at a particular temperature. Let x be the number of moles of Iodine converted into hydrogen iodide under the equilibrium conditions

I2 +H2 = 2HI

Derive Kp and Kc

State the relationship between Kc and Kp

A hydrocarbon compound has a molecular formula of C3H8. If ignited, it reacts with oxygen (O2)

to form water vapor and carbon dioxide.

a. Write the balanced equation for the reaction described above.

b. From 5.76 g of the hydrocarbon, calculate the volume in liters of carbon dioxide that will be

produced under STP.

A sample of copper weighing 7.55 kg has undergone heating. Its temperature has risen from 25oC

to 329.8oC. Given a specific heat capacity of 0.385 J/g oC, what is the total heat absorbed by the

metal in kJ?

1.      When 1.42 g of iron reacts with 1.8 g of chlorine, 3.22 g of  and 8.6 kJ of heat is produced.  What is the enthalpy change in kJ for the reaction when 1 mole of  is produced?  

magnesium oxide has a high melting point carbon dioxide has a low melting point which row identifies the attractive forces that are broken when these compunds are melted

Hydrogen gas (H2) reacts with carbon dioxide to produce gaseous water and carbon monoxide.

a. Write a balanced reaction for the reaction.

b. Calculate ΔG

o

for the reaction if Kp is given to be 4.40 measured at 2000K.

c. Calculate for the ΔG of the reaction when the partial pressures are 0.25 atm for H2, 0.78 atm

for carbon dioxide, 0.66 atm for water and 1.20 atm for carbon monoxide.

. A 0.3471-g sample of a mixture of oxalic acid, which has two ionizable protons, and benzoic acid, which has one, is treated with 100.0 mL of 0.1000 M NaOH. The excess NaOH is titrated with 20.00 mL of 0.2000 M HCl. Find the mass % of benzoic acid.