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3 years ago

PLEASE HELP! It'll mean the world to me

Chemistry

1 answer:

Vikki [24]3 years ago

8 0

Answer:

24 a 2.85

Explanation:

HCl is a powerful acid so it completely ioniz in water

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The table below gives the atomic mass and relative abundance values for the three isotopes of element M.

Serhud [2]

The average atomic mass formula is:

$average atomic mass = \Sigma (percent abundane)\times (atomic mass)$

Substituting the values in the formula:

$average atomic mass = \frac{78.99\times 23.9850+10\times 24.9858+11.01\times 25.9826}{100}$

$average atomic mass = \frac{1894.57515+249.858+286.068426}{100}$

$average atomic mass = 24.30516 amu$

Hence, $24.30516 amu$ is the average atomic mass of element M.

7 0

3 years ago

Is colour a chemical or physical

dexar [7]

Answer:

Physical property

Explanation:

hope this helped!

6 0

3 years ago

In order to dry wet clothes, we spread them on a clothline. This is because (i) spreading increases surface area (ii) clothes be

Novosadov [1.4K]

Answer:

this is because spreading it makes more sunlight hit the cloth which results in it drying faster

3 0

3 years ago

Convert the following mole of ratio of elements to empirical formula 2.0 mol of Fe and 2.66 mol of O

Pavlova-9 [17]

Your answer = 3.2 .. thank you

3 0

3 years ago

If aluminum is diffused into a thick slice of silicon with no previous aluminum in it at a temperature of 1100˚C for 8 hours, wh

RideAnS [48]

Answer:

8.354 nanometers

Explanation:

To treat a diffusive process in function of time and distance we need to solve 2nd Ficks Law. This a partial differential equation, with certain condition the solution looks like this:

$\frac{C_{s}-C{x}}{C_{s}-C_{o}}=erf(x/2\sqrt{D*t})$

Where Cs is the concentration in the surface of the solid

Cx is the concentration at certain deep X

Co is the initial concentration of solute in the solid

and erf is the error function

Then we solve right side,

$\frac{C_{s}-C{x}}{C_{s}-C_{o}}=\frac{1018atoms/cm3-1016atoms/cm3}{1018atoms/cm3}=0.001964$

And we need to look up the inverse error function of 0.001964 resulting in: 0.00174055

Then we solve for x:

$x=0.00174055*2*\sqrt{D*t} =0.00174055*2*\sqrt{2*10^{-12}cm^{2}/s*8h*3600s/h}=8.35464*10^{-7}cm$

6 0

3 years ago