Recent content by Kelly09

Vitamin B5 is called niacin or nicotinic acid. Its percentage composition by mass is (58.4% Carbon) (4.09% Hydrogen) (25.99% Oxygen) and (11.38% Nitrogen). What is the empirical formula of vitamin B5?

when drawing the structural formula for 2-methylbutane or 2,3-dichloro-2-methylbutane,does it matter which end of the chain i begin counting from?

thankyou

i am stuck on this question and people are giving me different answers. Ok which period 3 element has the following succesive ionization energies: 1800,3000,3600,5800,13200

The succesive ionization energies in kj/mol of an element x found in period 3 of the periodic table are: 1800,3000,3600,5800,13200. With the aid of a periodic table,what is element x?

Galium has 3 positive ions. So i guess Nitrogen have 3 negative ions and therefore gaining 3 electrons.

here is my problem. Galium Nitride is an Ionic Compound. Work out the electron arrangement of the Nitrogen ion

0.0005mol/dm3

M is concentration. There are two ways of writing it,M or mol/dm3

Concentration=moles/volume Moles = mass/atomic mass, 5.8g/Na2C03 So 5.8/106=0.005moles. Conc=0.05/100=0.0005M. So?

I found concentration to be 0.0005M. Could you confirm if this is correct?

Mass of Na2CO3 is 5.8g

Hi guys,here is my question. What is the Concentration of Na2CO3 when it dissolves in a solution and forms a volume of 100 cubic cm? Concentration= moles/volume. I found moles using mass/atomic mass of Na2+C+03. Then i used moles/volume to calculate concentration. Correct?

How many Gold atoms are in Gold mass of 2.5g? 15 percent of the mass is pure Gold. So first i found 15 percent of the mass which i used to calculate the number of moles. Then i multiplied the moles by Avogadros number to give me the atoms. Anyone help