A3.31 g sample of lead nitrate, pb(no 3 ) 2 , molar mass = 331 g/mol, is heated in an evacuated cylinder with a volume of 1.62 l. the salt decomposes when heated according to the equation: . assuming complete decomposition, what is the pressure in the cylinder after decomposition and cooling to a temperature of 300 k? assume the pbo takes up negligible volume.

Explanation:

Given:

Now, no. of moles:

where:

m = mass in gram

M = molecular mass

From the ideal gas law:

33: i think it’s b

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west