Physical Chemistry Answers

For the reaction N2+3H2 2 NH3, ΔH is negative. What will be effect on the product if
temperature is lowered and pressure is raised? Explain.

Convert 20g NaOH in 500 centi meter cube solution into MOLARITY.

0.1 mole of PCl5 is heated to 250 C in decimeter cube container .calculate the concentration of chlorine at equilibrium.(Kc at 250 C=0.414)

I have checked wikipedia it says the IUPAC name is Sodium pentacyanonitrosylferrate(II). But according to me its Sodium pentacyanonitrosylferrate(III).

Na2[Fe(CN)5NO]

Oxidation number calculation

-2= x + (-5) + 0 => x= 5-2= 3

So the oxidation number of Fe should be 3.

Shouldn't the oxidation number be 3? What is the correct IUPAC name?

Can solids exist in equilibrium with vapour? I'm talking about non-sublimable solids, like for example ice?
I was reading a definition which said Freezing point of a liquid is that temperature at which vapour pressure of the liquid phase equals to the vapour pressure of the solid phase. So my question is does solid exist in equilibrium with vapour? I don't get the chemistry behind it. I mean to say how can solidified molecules travel into air and form vapour?

Why is concentration multiplied to number of moles?

Here's a link to the reference: http://chemistry.stackexchange.com/questions/54601/why-is-c-concentration-multiplied-to-1-alpha-number-of-moles

Are colligative properties intensive properties?

Physical properties of a solution like melting point and boiling points are intensive properties but are colligative properties, like elevation of b.p and lowering of freezing point too intensive properties?

I have searched the net and found a Pharmacy book that says that they are intensive properties but I wanted to reassure from experts.

What is the molality of this solution?

A dilute soln is prepared by dissolving W2 g of a non-volatile and non-electrolyte solute (M.wt.=M2) in W1 g of a solvent (M.wt=M1). What is the concentration of solute in molality?

In W1 g of solvent, no.of moles of solute present is W2/M2 moles

In 1 g of solvent, no. of moles of solute present is W2/(M2 x W1) moles

In 1000g of solvent, no. of moles of solute present is W2 x 1000/ (M2 x W1) moles = say n

So, is Molality= no. of moles of solute/ 1000g of solvent

= n/1000 ?

A gas mixture contains oxygen and nitrogen in the ratio of 1:4 by weight. The ratio of their number of molecules is?

A solution with weight percent of sodium hydroxide of 6% is prepared by adding the following mass of water to 200 grams of that solution with a weight percent of NaOH of 30%.Find the amount of water to be added?