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lesantik [10]
2 years ago
13

HELP 10pts!

Chemistry
1 answer:
masha68 [24]2 years ago
5 0

IM IN THAT CLASS TOO

Im abt to do it and ill send u all the answers when im

done, add me on sxxap or instaxxxgram so i can send it to u

my userneamen both: Bellaberrygood

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HELP!!! WILL GIVE BRAINLIEST!!!! 30 POINTS
NikAS [45]

Answer:

carbon = 7 atoms

hydrogen = 8 atoms

nitrogen = 4 atoms

oxygen = 2 atoms

Explanation:

Chemical formula = C₇H₈N₄O₂

Elements present:

carbon

hydrogen

nitrogen

oxygen

Number of atoms of each element.

carbon = 7 atoms

hydrogen = 8 atoms

nitrogen = 4 atoms

oxygen = 2 atoms

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3 years ago
What is the chemica composition if the sun
nadezda [96]
The sun is mostly Hydrogen with some helium. It also has traces of other elements like various metals.
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3 years ago
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Match the mixture with its description.
Fiesta28 [93]

Solution – A. 

Emulsions – B.

Colloid – C.

Homogenous – D.

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3 years ago
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A 25.0 mL sample of a saturated C a ( O H ) 2 solution is titrated with 0.029 M H C l , and the equivalence point is reached aft
Gnesinka [82]

Answer:

0.043 M

Explanation:

The reaction that takes place is:

  • Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O

First we <u>calculate how many HCl moles reacted</u>, using the <em>given concentration and volume required to reach the equivalence point</em>:

  • 0.029 M HCl * 37.3 mL = 1.0817 mmol HCl = 1.0817 mmol H⁺

As 1 mol of H⁺ reacts with 1 mol of OH⁻, in the 25.0 mL of the Ca(OH)₂ sample there are 1.0817 mmoles of OH⁻.

With that in mind we can <u>calculate the hydroxide ion concentration in the original sample solution</u>, using <em>the calculated number of moles and given volume</em>:

  • 1.0817 mmol OH⁻ / 25.0 mL = 0.043 M
3 0
3 years ago
A gas occupies a volume of 67.54 liters at 158°C and 4.87 atm pressure. Calculate the number of moles of this gas.
Katarina [22]

Answer:

The number of moles of the gas is 9.295 moles or 9.30 moles

Explanation:

We use PV = nRT

Where P = 4.87 atm;

V = 67.54 L

R= 0.0821Latm/molK

T = 158 C = 158 +273 K = 431 K

the number of moles can be obtained by substituting the values in the respective columns and solve for n

n = PV / RT

n = 4.87 * 67.54 / 0.0821 * 431

n = 328.9198 / 35.3851

n = 9.295moles

The number of moles is approximately 9.30moles.

6 0
3 years ago
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