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Ilia_Sergeevich [38]
3 years ago
11

Help :L

Chemistry
2 answers:
jok3333 [9.3K]3 years ago
5 0

Answer:

1.6 g/cm3

Explanation:

The formula for Density is actually D=m/v

m= 12.9g

v= 8 cm3

D= \frac{12.9}{8} =1.6125

The unit is grams per centimeters cubed or g/cm3

(If you use the formula given in the question it would be D=0.62)

katen-ka-za [31]3 years ago
5 0

Answer:

1.6 g/cm3

just had this question

Explanation:

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True or false all countries are legally bound to survey and monitor for disease within their bodies
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Answer:

False..........

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Which would be a good source to find weather information about your town from last month?
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a reference book about weather

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A chemistry graduate student is given 500. mL of a 0.20 M chloroacetic acid (HCH2ClCO2) solution. Chloroacetic acid is a weak ac
zhenek [66]

Answer:

12 g of choloracetic acid

Explanation:

The buffer equilibrium is:

HCH₂ClCO₂ ⇄ CH₂ClCO₂⁻ + H⁺

pka= -log ka =

Ka: 1,3x10⁻³ = [CH₂ClCO₂⁻] [H⁺] / [HCH₂ClCO₂]

By Henderson-Hasselbalch equation:

pH = pka + log₁₀ [A⁻] / [HA]

3,01 = 2,89 + log₁₀ [A⁻] / [HA]

1,318 = [A⁻] / [HA]

As molar concentration of chloroacetic acid (HA) is 0,20M

[A⁻] = 0,26 mol/L

The volume is 500 mL ≡ 0,5 L

0,26mol/L × 0,5 L = 0,13 moles of chloroacetic acid. In grams:

0,13 mol × (94,5g / 1mol) = <em>12 g of choloracetic acid</em>

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I hope it helps!

3 0
3 years ago
SOMEONE PLEASE HELP I WILL GIVE YOU BRAINLIEST IF YOU GET IT RIGHT.
VladimirAG [237]

Answer:

A (H)

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Write a balanced half-reaction for the reduction of permanganate ion mno−4 to solid manganese dioxide mno2 in acidic aqueous sol
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The half-reaction includes either the reduction or the oxidation reaction of the redox reactions. In acidic solution permanganate ion will react with hydrogen ion to yield manganese ion and water.

<h3>What are Redox reactions?</h3>

Redox or oxidation-reduction reactions are the chemical reactions in which the oxidation and the reduction of the chemical species occur simultaneously.

Permanganate (VII) ion is a strong oxidizing agent and gets easily reduced to manganese ion in presence of the hydrogen ion in an acidic solution.

The balanced half-reaction for reduction is shown as,

\rm MnO_{4}^{-} \; (aq)+ 8H^{+} \; (aq)+ 5e^{-} \rightarrow Mn^{2+} \; (aq)+ 4H_{2}O \; (l)

Learn more about reduction reactions here:

brainly.com/question/10084275

#SPJ4

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