The molecular mass of a substance is the sum of the atomic masses of all the atoms in a molecule of the substance.

Molecular mass is calculated by multiplying average atomic mass of each element by the number of its atoms and adding them together. e.g., Molecular mass of carbon dioxide (CO2) is calculated as follows...

Atomic mass of H = 1, P = 31 and 0=16 The mass percentage of hydrogen, phosphorus, oxygen in H3PO4 Formula : Percentage (by weight) =   \(\frac{Mass\,of\,the\,element\,in\,1\,mole \,of\,compound}{Molar\,mass\,of\,the\,compound}\) x 100 Calculation :  Molecular formula of phosphoric...

Option : (C) C6H6

An atom of an element ‘X’ having atomic number ‘Z’ and atomic mass number ‘A’ is represented as : \(^A_ZX\) 

A) C.B. Van Neil

Correct option is B) element

A) x = H2 ; y = O2

D) P – S, Q – U, R – T

Correct Answer - 1,-1,2

1. 15  2. 16