Project #75335 - chemistry Questions

here are the questions:

 

1-  A student heats a 0.364 g sample of CaSO4.nH2O.  After all of the water is driven off, the mass of the anhydrous CaSO4 is 0.288 g. how many moles of water are driven off?

 

2-Consider 235U. How many protons are present in this nuclide?

 

3-Given the following sequence of reactions:

2H2S (g) + 3 O2 (g) ==> 2H2O (g) + 2 SO2 (g)

2 SO2 (g) + O2 (g) ==>2 SO3 (g)

SO3 (g) + H2O (l) ==> H2SO4 (aq)

3 H2SO4 (aq) + Al2 (CO3)3 (s) ==> Al2 (SO4)3 (s) + 3 H2O (l) + 3 CO2

If 0.3 moles of H2S (g) are reacted and all other reactants are in excess, how many moles of Al2 (SO4)3 (s) will be produced? 

4-Assign oxidation numbers to each chlorine atom and each manganese atom in the following chemical equation:

  Cl2 (g) + b  2 MnO4- (aq) + 4 H+ (aq) ==>  2 ClO3- (aq) +  2 Mn2+ (aq) + 2 H2O (l).

a -__

b-__

c-__

d-__

5-Given the following information :

2 Ga2O3 (s) ==> 4Ga (s) + 3 O2 (g)  ΔH = + 2158 kJ

What is the standard enthalpy of formation of Ga2O3 (s)?

6-How many "equivalent" atoms belong to a single body-centered cube unit cell?

7-A 2.0 L flask of nitrogen gas, N2, at a pressure of 3.6 atm is connected to a 4.0 L flask that contains oxygen gas, O2, at 2.4 atm pressure. A stopcock between the flasks is opened and the gases are allowed to mix.

After mixing, what is the total pressure in the flask?

8-Hydrogen reacts with oxygen to produce water. If you react 2.0 grams of hydrogen with 32.0 grams of oxygen what is the limiting reagent?

9-Consider the reaction: NO2 (g) + CO (g) ==> NO (g) + CO2 (g).

Given the following rate data- What is the rate law for the reaction?

 

Exp

[NO2]

[CO (g)]

Initial Rate (mol/L-s)

1

0.138

0.100

0.0060

2

0.276

0.100

0.0240

3

0.276

0.300

0.0240

 

 

10-An unknown hydrocarbon is subjected to elemental analysis. The results of this test show that the compound is 83.24% carbon and 16.76% H. With a molar mass of 72 g/mole, the molecular formula of this compound is:

please no crazy prices....

Subject Science
Due By (Pacific Time) 06/30/2015 06:30 pm
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