Inorganic Chemistry Answers

Given the following thermochemical equations:

X2 + 3Y2 ----> 2XY3 ^H1= -370 kJ

X2 + 2Z2 ----> 2XZ2 ^H2= -170 kJ

2Y2 + 2Y2Z -----> 2Y2Z ^H3= -280 kJ

Calculate the change in enthalpy for the following reaction:

4XY3 + 7Z2 -----> 6Y2Z + 4XZ2

change H= ________ kJ

The density of lead is 111.342 g/cm3. What would be the volume of a 200.0 g sample of this metal?

How many grams of tin would occupy 15.5 L, if it has a density of 17.265 g/cm3?(hint 1L=1000cm3)

Calculate the number of protons neutrons , electrons and neutrons of calcium ion of CaCl2?

how much hydrogen in grams could be obtained from 4.5L of water?

What would be the speed of the following particles if they had the same wavelength as a photon of red light (λ = 750.0 nm)? If MASS or proton is 1.673x 10^-24?
nuetron is 1.675x 10^-24?
election is 9.109 x 10^-28?
alpha part 6.645x 10^-24 (grams)

the following reaction takes place


3 CuO(s) +2NH3(g)--->3 Cu(s) +N2(g)+ 3 H20(g)


50.0g of CuO(s) was placed in an 80.0 L vessel, and the vessel was evacuated. Ammonia gas was the gradually introduced into the vessel, slow enough for the reaction to proceed, until the total pressure in the vessel (after reaction) was 1.00atm. what are the partial pressures of all 3 gases in the vessel? (Temperature is 180degrees celcius) Please show how you arrived at the answers.

why do we use sodium salts and not potassium salts in experiments

true or false, the stronger the acid, the lower the number on the pH scale

a.
Calculate the average mass (in grams) of an individual atom of silver.
b.
Calculate the mass (in grams) of 10 trillion silver atoms.
c.
Calculate the mass (in grams) of 5.00
ϫ
10
45
silver atoms.