Subjective Type

What is the average atomic mass of silicon? Given the following data, calculate the average atomic mass of silicon. isotope = Si-28 amu =27.9769 abundance(%) =92.18 isotope = Si-29 amu =28.9765 abundance(%) =4.71 isotope =Si-30 amu =29.9738 abundance(%) =3.12

Solution

Answer
Multiply the amu by the percentage of occurrence to arrive at an average atomic mass of 28.0891
Explanation:
We take the amu of each isotope, multiply it by the percentage of occurrence, and end up with a weighted average:
$$ 27.9769 \times 9218 + 28.9765 \times .0471 + 29.9738 \times 0312 $$(quick note - there is a bit of rounding in here - the abundance percentages add up to 1.01, so the number we calculate is going to be slightly off).
This simplifies to:
25.7891+1.3648+0.9352=28.0891
Checking "the internet" to verify our answer, I found 28.0855 u 0.0003 u, so the answer calculated for our question is pretty close.

SIMILAR QUESTIONS

If $$R=\left\{\left(x,y\right):y=2x\right\}$$ is a relation in $$A=\left\{1,2,3,4,6,7,8\right\}$$ then write all the elements of $$R$$

Let $$X=\left\{1,2,3,4\right\}$$.Determine whether $$f=\left\{\left(1,1\right),\left(2,3\right),\left(3,4\right),\left(4,1\right)\right\}$$ are functions from $$X$$ to $$X$$

Let the universal set U, be a set all students of your school, A is set of boys. B is the set of girls C is the set of students participating in sports. Describe the following set in words and represent them by the Venn diagram. $$B \cap C$$

If $$A = $${1,4,6}, $$B = $${3,6}, then find $$(A \cap B)$$

Find the number of whole numbers in the solution set of following $$x - 5 <-2$$

Find the solution of the following: If $$5x + 4 > 8x - 11$$, then $$x

Say true or false. The A.M. between $$(a-b)^2$$ and $$(a+b)^2$$ is $$a^2+b^2 $$.

Given a line I and a point P on it. How many lines can be drawn passing through the point P?

If lines $$l_1\, \perp\, l_2$$ and the the slope of $$l_1$$ is $$\dfrac{1}{2}$$, then the the slope of $$l_2$$ is .......... .

Contact Details