1. Zn (s) + 2Hcl(aq) -----> Zncl2(aq) + H2(g). what mass of Hcl is required to react cpmpletely with 4.25 moles of zinc? [ atomic mass: H=1.0u , Cl=35.5u]
2. name the series of lines observed in the emission spectrum of hydrogen in which the minimum value of n2=2. calculate the wavelength of first line of this series [RH=109677 cm^-1]
3. list wrong assumptions of kinetic theory of gases which led to van der waals equation.
4. what is meant by the term system and surrounding as used in thermodynamics? illustrate with the help of an example.
5. name the alkali metal which forms(i) only monoxide,(ii) peroxide and (iii) superoxide. write the chemical equation for the formation of peroxide.
Answers
Answered by
22
1. 1 mol of zn needs 2 moles of hcl
therfore 4.25 moles of zn needs
4.25×2=8.5 moles.
one mol hcl=36.5 gm,then
8.5 moles of hcl=36.5×8.5=310.25
therfore 4.25 moles of zn needs
4.25×2=8.5 moles.
one mol hcl=36.5 gm,then
8.5 moles of hcl=36.5×8.5=310.25
Similar questions