Atomic weight and molecular weight - class-XII
Description: atomic weight and molecular weight | |
Number of Questions: 16 | |
Created by: Palash Sundaram | |
Tags: moles and equations atoms, molecules and chemical reactions chemistry gas laws and mole concept some basic concepts of chemistry quantitative chemistry the nature of matter atoms and molecules basic concepts of chemistry mole concept and stoichiometry stoichiometry the language of chemistry |
An element $X$ have three isotopes $X^{20}, X^{21}$ and $X^{22}$. The percentage abundance of $X^{20}$ is $90\%$ and its average atomic mass of elements is $20.18$. The percentage abundance of $X^{21}$ should be ______________.
The fractional abundance of $Cl^{35}$ in a sample of chlorine containing only $Cl^{35}$ (atomic weight $=34.9$) and $Cl^{37}$ (atomic weight $=36.9$) isotopes, is $0.6$. The average mass number of chlorine is _______________.
The $O^{18}/O^{16}$ ratio in some meteorites is greater than the used to calculate the average atomic mass of oxygen one earth. The average mass of an atom of oxygen in these meteorites is ______ that of terrestrial oxygen atom?
In the atomic weight determination. Dalton suggest the formula of water as $HO$ and the composition of water as hydrogen $=12.5\%$ and oxygen $=87.5\%$ by weight. What should be the atomic weight of oxygen on $H-$scale, on the basis of this information?
The isotopes of chlorine with mass numbers $35$ and $37$ whose average mass is 35.5 exist in the ratio of:
The relative atomic mass of naturally occurring chlorine is not a whole number. What is the reason for this ?
Among the following quantities:
(i) mass number
(ii) average mass of a Carbon atom in amu
(iii) the charge of nucleus in amu and
(iv) mass of a Carbon -12 atom in grams
What is the approximate molecular mass of dry air containing 78% N$ _2$ and 22% O$ _2$?
What weight of sodium contains the same number of atoms as those in $8$ grams of oxygen?
What is the atomic mass of sodium?
What is the relative atomic mass of cadmium?
Which of the following is/are correct?
Oxygen occurs in nature as a mixture of isotopes $^16O$, $^17O$ and $^18O$ having atomic masses of 15.995 u, 16.999 u and 17.999 u and relative abundance of 99.763%, 0.037%, and 0.200% respectively. What is the average atomic mass of oxygen?
For every ,one $^{37}Cl$ isotope there are three $^{35}Cl$ isotopes, in a sample of chlorine. What will be the average atomic mass of chlorine?
One gm metal $M^{3+}$ was discharged by the passage of $1.81\times 10^{23}$ electrons. What is the atomic mass of metal?