General Chemistry Answers

1.   An 760 g aluminum block cools from 95˚C to 50.˚C. Given that the specific heat capacity of aluminum is 0.900 J/g.˚C, calculate the heat released. 

(thermochemistry)

1.    The specific heat capacity of zinc is 0.388 J/g.˚C. Calculate the initial temperature of zinc block of mass 38g if the amount of heat supplied to it was 220 J and the maximum temperature reached by the zinc block was 55˚C. 

what is the volume of 6.9 mol oxygen gas at 233 K and a pressure of 4.0 atm?

On dissolving 7.258 gm of HCN. (Ka=7.2×10'-10) in water. The solution becomes 100ml. So the degree of ionization of acid equals ?

 Aqueous solutions of sodium sulfide, Na2S, and copper nitrate, Cu(NO3)2, are mixed.  A precipitate of copper sulfide, CuS, forms at once.  Left behind is a solution of sodium nitrate, NaNO3.   Write the net ionic equation for this reaction.

     [H3O+]=2.3 x 10-9 M

What is the formula of the compound in which the atom combining ratios are:

• sulfur : oxygen : fluorine  =  1 : 2 : 2

What is the percent composition of the element hydrogen in the compound methane, CH4?

Its about avogadro's law for gases..

If the ratio of masses in a container of O2 and N2 is 1:4. Then the ratio of there molecules will be..?

A) 7:32

B) 32:7

C) 4:1

D) 1:4

E) none

Its about grahams law..

4g of H2 diffuses from a vessel in 5 minutes. How much SO2 will diffuse from same vessel in 5 minutes?