on chemical scale, the relative mass of the isotopic mixture of x atoms (x^20,x^21,x^22) is approximately equal to:(x^20 has 99 percent abundance)

Well, if x^20 is the star of the show with 99% abundance, then x^21 and x^22 must be feeling a bit left out. They'll have to make do with the remaining 1%. So, the relative mass of the isotopic mixture would be approximately equal to x^20 being the popular one, while x^21 and x^22 try to keep up the positive vibes despite their lower abundance. Just remember, it's all about finding balance in the chemical world!

To find the relative mass of the isotopic mixture given the abundance of each isotope, you can calculate the weighted average mass.

Here, we have three isotopes with different abundances:
- Isotope x^20 has an abundance of 99%.
- Isotope x^21 has an unknown abundance.
- Isotope x^22 has an unknown abundance.

To calculate the relative mass of the isotopic mixture, we need to consider the abundance and mass of each isotope.

The relative mass can be calculated using the formula:
Relative mass = (abundance1 * mass1) + (abundance2 * mass2) + ... + (abundanceN * massN)

Let's calculate the relative mass:

Relative mass = (0.99 * x^20 mass) + (abundance2 * x^21 mass) + (abundance3 * x^22 mass)

Since the relative mass is approximately equal, we can assume that abundance2 and abundance3 sum up to 1%.
So, the relative mass of the isotopic mixture can be simplified as:

Relative mass ≈ (0.99 * x^20 mass) + (0.01 * (x^21 mass + x^22 mass))

Keep in mind that the actual mass values of x^20, x^21, and x^22 are not provided in the question. Therefore, without knowing the specific mass values, we cannot determine the exact relative mass. However, you can substitute the specific mass values of x^20, x^21, and x^22 into the equation to calculate the approximate relative mass.

20.002

20.002 is the answer given.

20.002

If 99% is 20 the the total must be approximately 20.

Note: I stated at the top and worked down before realizing you had writer's cramp from all of your questions. This is not a place to dump your homework but for today I have helped with each one. In the future you need to show your work, how you would answer the questions AND especially important is to explain exactly what you don't understand about the problem/question. The more information you provide about what part is troubling you the better I can address your concerns.