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Sever21 [200]
3 years ago
10

If a sample of pure sodium has a mass of 8.2 grams and sodium has an average atomic mass of 22.99 g/mol, how many sodium atoms a

re there in the sample?
3.21 x 1021 atoms
2.15 x 1023 atoms
1.69 x 1024 atoms
1.13 x 1026 atoms
Mathematics
1 answer:
Nonamiya [84]3 years ago
7 0
8.2 grams = 1 mol
Na ________
22.99 grams

First multiply the value of 8.2 to 1. Then divide by the value of 22.99 to determine the number of moles of sodium present in the 8.2 gram sample.

Then use the following equation to solve for sodium atoms.

Number of moles of Na • Avogadro Number = Number of sodium atoms.

0.3566782 • (6.02 X 10^23). = 2.1472 X 10 ^ 23. Or 2.15 X 10 ^ 23.

The answer is the second option - 2.15 X 10 ^ 23.
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Solve the inequality algebraically. Write the solution in interval notation.<br> |9x + 10| &lt; 15
viva [34]

The given inequality is

| 9x+ 10 |

First we need to remove the absolute sign , and when we do so , we will get a compound inequality, that is

-15< 9x+10 < 15

To solve for x, first we need to get rid of 10. and for that, we have to do subtraction

-15-10

Now we need to get rid of 9, and for that, we do division

\frac{-25}{9}< x< \frac{5}{9}

So the required solution is

( \frac{-25}{9} , \frac{5}{9})

5 0
3 years ago
Hello can someone try and help me
lyudmila [28]

Answer:

f(x)=-4x+/4

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y=-4x+4

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x=-4y+4

x-4=-4y

(x-4)/-4=y

y=-(x-4)/4

f-¹(x)=-(x-4)/4

yeah you are right

4 0
3 years ago
What is 78/10 expressed as a decimal?
Pavel [41]

Answer:

7.8

Step-by-step explanation:

3 0
3 years ago
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What is the equation of the line in point-slope form?
Alisiya [41]

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Step-by-step explanation:

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Name: 1. Label the axes. 2. Graph: A(-3, 0) B(-2, 4) C(1, -1) Draw AABC in blue. 3. Rotate AABC 90° clockwise to create AA'B'C'
nikklg [1K]

Answer:

its B because

Step-by-step explanation:

Simplifying

41n(7x) = 8

Remove parenthesis around (7x)

41n * 7x = 8

Reorder the terms for easier multiplication:

41 * 7n * x = 8

Multiply 41 * 7

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Multiply n * x

287nx = 8

Solving

287nx = 8

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Divide each side by '287x'.

n = 0.02787456446x-1

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n = 0.02787456446x-1

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2 years ago
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