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Pie
3 years ago
5

A sample of copper (Cu) contains 69.17% Cu-63. The remaining copper atoms are Cu-65. What is the average atomic mass of copper?​

Mathematics
1 answer:
jeyben [28]3 years ago
5 0
The atomic mass is 63.55 amu
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Problem Page
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If order matters, then there are 12 ways to do this

If order does not matter, then there are 6 ways to do this

===========================================

We have 4 choices for the first slot and 3 choices for the next (we can't reuse a letter) so that's where 4*3 = 12 comes from

If order doesn't matter, then something like AB is the same as BA. So we are doubly counting each possible combo. To fix this, we divide by 2: 12/2 = 6

To be more formal, you can use nPr and nCr to get 12 and 6 respectively (use n = 4 and r = 2)

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What is the volume of this rectangular prism?
sergiy2304 [10]

Answer:

V =\frac{12}{5}\ cm^3

Step-by-step explanation:

<u>The Volume of Rectangular Prism</u>

Given a rectangular prism of dimensions W, L, and H, its volume is the product of the three dimensions:

V = WLH

The figure shows the dimensions:

L=3 cm

W=\frac{4}{3}\ cm

H=\frac{3}{5}\ cm

Thus, the volume is:

V =3*\frac{4}{3}*\frac{3}{5}\ cm^3

V =\frac{36}{15}\ cm^3

Simplifying:

\boxed{V =\frac{12}{5}\ cm^3}

5 0
3 years ago
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