Monel steel is a corrosion-resistant copper-nickel alloy used within the electronics trade. A specific alloy with a density of 8.80 g/cm3 and containing 0.044% Si by mass is used to make an oblong plate that’s 15.0 cm lengthy, 12.5 cm broad, and a pair of.50mm thick and has a 2.50-cm-diameter gap drilled by means of its middle such that the peak of the outlet is 2.50mm .

First discover the quantity of the plate with out accounting for the outlet:

V = (15.0 cm)(12.5 cm)(0.250 cm) = 46.875 cm^3

The amount of the outlet is: (pi)(1.25 cm)^2(0.250 cm) = 1.2272 cm^3

Subtract the quantity of the outlet from the remainder: 45.648 cm^3

Multiply this by the density of the alloy to search out the mass: (8.80 g/cm^3)(45.648 cm^3) = 401.701 g.

0.044% of that is Si, so (0.00044)(401.701 g) = 0.17675 g is silicon.

i do not see what to do with the mass of the isotope you got. The pure abundance shouldn’t be by mass, however by the variety of atoms.

So…i would use the typical atomic mass of silicon and Avogadro’s quantity to search out the variety of silicon atoms:

(0.17675 g)(1 mol/28.0855 g)(6.022E23 atoms/1 mol) = 3.794E21 atoms of Si.

3.10% of those are Si-30: (0.0310)(3.794E18 atoms) = 1.176E20 atoms of Si-30

Or, with two vital figures, 1.2E20 atoms.

Assuming it is a impartial atom, it’s going to have 14 electrons; 1 proton offers a +1 cost, 1 electron offers a -1 cost. To be impartial, it has to have the identical variety of every, therefore 14 electrons.

Monel Density

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