Molecular mass : The molecular mass of a molecule, of an element or a compound can be defined as a number which indicates how many times heavier is the molecule of that element or compound as compared with of the mass of an atom of carbon-12. Molecular mass is the ratio and hence has no units. It can be expressed in a.m.u.

         Actual mass of the one molecule = Mol mass * 1.66* 10^-24 gm 

         The molecular mass of the substances is the additive property and can be calculated by adding the atomic masses present in one molecule.

    
The gram molecular mass (GMM) and the Gram molar volume: The molecular mass of an element or a compound when expressed in gm is called its gram molecular mass, gram molecule or the mole molecule.

         Number of gm molecules =

         Mass of the substances in gm = Number of gm. molecules *GMM

         Volume occupied by one mole of any gas at the STP is called Gram molar volume. The value of gram molar volume is given by 22.4 litres. Volume of 1 mole of any gas at the STP = 22.4 litres    

         The expression for mass and density

         The mass of 11.2 L of any gas at STP = V.D. of that gas in gm.

         The density of a gas at NTP = 

        
Important generalizations

         The number of atoms in a substance

               = Number of GMM * 6.02 *10²³ * Atomicity 

         Number of electrons in the given substance can be calculated as

                             = Number of GMM * 6.02 * 10²³ * Number of electrons

Email based Chemistry assignment help - homework help at Expertsmind

Are you searching chemistry expert for help with Molecular mass questions?  Molecular mass topic is not easier to learn without external help?  We at www.expertsmind.com offer finest service of Chemistry assignment help and chemistry homework help. Live tutors are available for 24x7 hours helping students in their Molecular mass related problems. We provide step by step Molecular mass question's answers with 100% plagiarism free content. We prepare quality content and notes for Molecular mass topic under chemistry theory and study material. These are avail for subscribed users and they can get advantages anytime.

Why Expertsmind for assignment help

1. Higher degree holder and experienced experts network
2. Punctuality and responsibility of work
3. Quality solution with 100% plagiarism free answers
4. Time on Delivery
5. Privacy of information and details
6. Excellence in solving chemistry queries in excels and word format.
7. Best tutoring assistance 24x7 hours