The super-evil mad scientist, Doctor Dysprosium, has decided to create gold! But

Question

The super-evil mad scientist, Doctor Dysprosium, has decided to create gold! But not the those old-fashioned alchemists failed to do (they tried to turn lead into gold). she has to start with atoms of copper and fuse them with another element such that the result the right number of protons. Which element should she choose to fuse with copper? 2. unfortunately fusing copper with that element won't have enough neutrons; copper's most Abundant isotope is copper-63 (also written 63Cu). Find a list of isotopes for the element you Chose in #1 and select the most abundant isotope. If she were to fuse Copper-63 with that neutrons will she have to add to get the mass number up to 197? 3.Doctor Dysprosium wants to create a single bar of gold. If a typical gold bar has a volume of Approximately 0.643L, how many atoms of gold does she need to produce? The density of Gold is 19.3g/cm^3 Cu + x = Au Solve for x

Explanation / Answer

1.Cu Z=29,A=63

Au Z=79,A=197

Cu+X=Au

29+x=79

X=Sn(Tin) from periodic table

2.Tin has 10 stable isotope of which the most abundant is 120Sn

so we are adding 120Sn with 63Cu

number of neutrons in Copper=34(A-Z)

number of neutrons in Tin=70

number of neutrons in gold=118

so the number of neutrons required =118-34+70=14

3.mass of gold=volumexdensity

=643cm3x19.3g/cm3

=12409.9g

196.967g=1 mol then

12409.9g of gold= x mol

x=1molx12409.9g/196.967g=63.005mol

=63.005molx6.023x1023=379.5x1023? gold atoms required

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