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sveticcg [70]
3 years ago
12

Gold is reacted with Bromine gas according to the reaction 2Au + 3Br2 → 2AuBr3 . Use the data table below to determine the perce

nt yield of Gold Bromide.
Mass of Gold Mass of Bromine Theoretical Yield Actual Yield

39.4g 15.0g ? 12.3


A: 97.29%

B: 45.02%

C: 89.5%

D: 86.42%

NEED HELP FAST!
Chemistry
1 answer:
Vanyuwa [196]3 years ago
4 0
These link people are annoying
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Which elements have the most similar chemical properties?
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Explanation:

Potassium and Sodium have a chemical symbol of K and Na respectively.

They have similar chemical properties because both

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Na --> Na+ + e-

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Thus, unlike the other pairs given, K and Na, have the most similar chemical properties

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3 years ago
What if you measured 15cc of liquid elemental mercury, how much would that weigh in pounds
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0.447 pounds

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The density of Mercury in grams/mL is 13.55 - I multiplied that by the volume and got approximately 203.25 grams, I then turned it into Kilograms and multiplied by 2.2 lbs / kg.

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3 years ago
What Happens During Fermentation?
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Answer:

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5 0
2 years ago
If acetic acid is the only acid that vinegar contains (ka=1.8×10−5), calculate the concentration of acetic acid in the vinegar.
kicyunya [14]
Ethanoic (Acetic) acid is a weak acid and do not dissociate fully. Therefore its equilibrium state has to be considered here.

CH_{3}COOH \ \textless \ ---\ \textgreater \   H^{+} + CH_{3}COO^{-}

In this case pH value of the solution is necessary to calculate the concentration but it's not given here so pH = 2.88 (looked it up)

pH = 2.88 ==> [H^{+}]  = 10^{-2.88} =  0.001 moldm^{-3}

The change in Concentration Δ [CH_{3}COOH]= 0.001 moldm^{-3}


                                  CH3COOH          H+           CH3COOH    
Initial  moldm^{-3}                      x           0                     0
                                                                                                                       
Change moldm^{-3}        -0.001            +0.001           +0.001
                                                                                                       
Equilibrium moldm^{-3}      x- 0.001      0.001             0.001
                                                                              

Since the k_{a} value is so small, the assumption 
[CH_{3}COOH]_{initial} = [CH_{3}COOH]_{equilibrium} can be made.

k_{a} = [tex]= 1.8*10^{-5}  =  \frac{[H^{+}][CH_{3}COO^{-}]}{[CH_{3}COOH]} =  \frac{0.001^{2}}{x}

Solve for x to get the required concentration.

note: 1.)Since you need the answer in 2SF don&t round up values in the middle of the calculation like I've done here.

         2.) The ICE (Initial, Change, Equilibrium) table may come in handy if you are new to problems of this kind

Hope this helps! 



8 0
3 years ago
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