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9966 [12]
4 years ago
9

Element X is found in two forms: 90.0% is an isotope that has a mass of 20.0, and 10.0% is an isotope that has a mass of 22.0. W

hat is the atomic mass of element X?
A. 20.0
B. 20.2
C. 20.8
D. 21.2
E. 21.8
Can anyone explain this one for me?
Chemistry
1 answer:
VMariaS [17]4 years ago
7 0
M_{X} = \frac{(20.0\cdot 90\%)+(22.0\cdot10\%)}{100\%} = \frac{2020}{100} = 20.2[u]

answer: B
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The line graph shows the heights of plants grown in fertilized and unfertilized soil. Based on this information, what will most
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3 years ago
How many moles of H2SO4 are present in 3.63 liters of a 0.954 M solution?
azamat
For this problem, we will use the formula setup for Molarity. 
The formula is M= moles
                               ---------
                                liters

So, lets plug in the numbers we have. We know M= 0.954, and L (liters)= 3.63. Lets plug that into our equation.
                         
                         x
         0.954= -----
                     3.63

As we can see, our moles are unknown.
So, lets multiply 0.954 times 3.63 to get our moles. 
0.954 x 3.63 equals 3.46302.

We know this is our correct answer, because when we divide 3.46302 and 3.63, we get 0.954.

Why?
Because when we divide the moles by liters, we get the molarity.

I hope I helped!!!!!

Here are some common units to know if my units confused you.
M= Molarity, which is what we find by dividing moles by liters
mol= Moles
L= Liters

5 0
4 years ago
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