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ArbitrLikvidat [17]
2 years ago
12

What is the electron configuration for helium (He)? 1s1 1s2 1s22s1 1s22s2

Chemistry
1 answer:
sdas [7]2 years ago
8 0

Answer:

your answer will be option B hope ur help and mark me brainlist

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Will GIVE BRAINLIEST --A student makes a standard solution of potassium hydroxide by adding 14.555 g to 500.0 mL of water. Answe
leva [86]

Answer:

0.5188 M or 0.5188 mol/L

Explanation:

Concentration is calculated as <u>molarity</u>, which is the number of moles per litre.

***Molarity is represented by either "M" or "c" depending on your teacher. I will use "c".

The formula for molarity is:

c = \frac{n}{V}

n = moles (unit mol)

V = volume (unit L)

<u>Find the molar mass (M) of potassium hydroxide.</u>

M_{KOH} = \frac{39.098 g}{mol}+\frac{16.000 g}{mol}+\frac{1.008 g}{mol}

M_{KOH} = 56.106 \frac{g}{mol}

<u>Calculate the moles of potassium hydroxide.</u>

n_{KOH} = \frac{14.555 g}{1}*\frac{1mol}{56.106g}

n_{KOH} = 0.25941(9)mol

Carry one insignificant figure (shown in brackets).

<u>Convert the volume of water to litres.</u>

V = \frac{500.0mL}{1}*\frac{1L}{1000mL}

V = 0.5000L

Here, carrying an insignificant figure doesn't change the value.

<u>Calculate the concentration.</u>

c = \frac{n}{V}

c = \frac{0.25941(9)mol}{0.5000 L}              

c = 0.5188(3) \frac{mol}{L}         <= Keep an insignificant figure for rounding

c = 0.5188 \frac{mol}{L}              <= Rounded up

c = 0.5188M               <= You use the unit "M" instead of "mol/L"

The concentration of this standard solution is 0.5188 M.

7 0
3 years ago
1. Mutations occur when the DNA does not copy itself correctly. Mutations are
Agata [3.3K]
1 is D 2 is c 3 is A and 4 the nucleus is so big because it is one of our largest cells in our body... hope this helps!!!!!!!!!!!
4 0
3 years ago
Does anybody know how to do this if so please help !
Viktor [21]

Answer:

add x to 7 and divide by 3

Explanation:

easier formula

3 0
2 years ago
If your good at science you could help me out so much!
Andrei [34K]

Answer:

Potassium (K) and Lithium (Li) for the fist one i cant see the second

Explanation:

6 0
2 years ago
Pls answer I am giving lots of points and need all the work shown. Determine the kb for chloroform when 0.793 moles of solute in
navik [9.2K]

Answer:0.87

Explanation:

8 0
3 years ago
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