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Questions (12)
1 mole of element x has mass, 0.444 times the mass of 1mole of element Y. one average atom of element x has mass 2.96 times the
3 answers
833 views
the no. of atoms in 558.5g of Fe (at wt = 55.85u) is:
1 answer
433 views
the atomic wt. of two elements A and B are 40 u and 80 u respectively. if x g of A contains y atoms, how many atoms are present
1 answer
1,227 views
the isotopic abundance of C-12 and c-14 is 98% and 2% by mass respectively. what would be the no. of atoms of c-14 isotope in
2 answers
927 views
1g of hydrogen contains 6x10^23 atoms. the atomic wt. of helium is 4 u. it follows that the number of atoms in 1g of He is:
2 answers
928 views
if the atomic mass of sodium is 23u the no. of moles in 46g of sodium is:
2 answers
409 views
a sample of ammonium phosphate (NH4)3PO4 contains 3.18 mole of H atoms. number of mole of o atoms in the sample is:
3 answers
681 views
the atmospheric pressure on mars is 0.61 kPa. what is the pressure in mm of Hg?
4 answers
2,852 views
which one of the following pairs of gases contains the same no. of molecules:
0 answers
637 views
the approximate no. of molecules of co2 present in 44g of co2 is:
2 answers
693 views
indium(atomic wt.= 114.82 u ) has two naturally occuring isotopes, the predominant one from has isotopic wt. 114.9041 and
4 answers
3,266 views
on chemical scale, the relative mass of the isotopic mixture of x atoms (x^20,x^21,x^22) is approximately equal to:(x^20 has 99
4 answers
2,568 views
