question plz help (1 Viewer)

[ying123123]

H+H -----> He

caculate the ,mass defect?

i got the answers but dont noe where the units come fomr?

mass of hydrogen = 6.68*10-27 where di this come form?
mass of HE = 6.646 * 10-27 where did this come form?

mass defect is minus from those units
and E=mc2

 

[ying123123]

this is Q 2Quarks

 

[Captain Gh3y]

Your data sheet contains the mass of a proton, neutron and electron. Think what hydrogen and helium consist of, and add them up.

 

[thunderdax]

But that doesn't really work. The equation should really have 2 deuteriums on the left hand side which gives 2 protons, 2 electrons 4 neutrons on both sides, giving the same mass. I think they'd have to give you more information for a question like this.

 

[Captain Gh3y]

Usually they should specify isotopes, usually deuterium, or maybe a ²₂He isotope, if such a thing exists.

 

[ying123123]

i caculated but dosnt work out
H = 1 atom 1 neutron 1 proton and 1 election?
add them and time 2 = 6.698*10-27

 

[ying123123]

o sori 2 H1 +2H1 ----->>>>>>>> 4H2

put the 1 under the 2

 

[richz]

its from the success one book right? if it is they have not given enuf info, they shud given the atomic mass of deutirium ie 2,1H