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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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mirsanch mirsanch
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12 years ago
I tried using De Broglie's equation, and I use m=v(lambda)/h
and this gives me the answer of 1.50x1025 m. I'm supposed to find the element but I don't know what to do after this.
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12 years ago
lambda = h/p where h is Planck's constant (6.626 * 10^-34 kg*m^2/s) and p is the momentum.

p = m* v, so lambda = h/(m*v). You know h, v and lambda, and you know the mass of 1 mole of each of those elements.

So you rearrange the equation as m = h/(lambda*v) and get that the mass of the particle is 6.677*10^-23 grams.

Avogadro's number is 6.022*10^23 mol^-1 and when you multiply 6.677*10^-23 grams by 6.022*10^23 mol^-1 and you get approximately 40 g/mol, so the element is Calcium.

Ca = 40 g/mol
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