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deff fn [24]
3 years ago
6

An Olympic medal contains 71.5% of gold by mass. How much gold could be extracted from a medal that weighs 115 grams? 1. 82.2 mo

l 2. 0.817 mol 3. 0.417 mol 4. 31.7 mol 5. 14.1 mol 6. 1.33 mol
Chemistry
1 answer:
worty [1.4K]3 years ago
7 0

Answer:

0.417 mol could be extracted from a medal that weighs 115 grams

Explanation:

Our Olympic medal weighs 115 g and we know that 71.5% is gold so how much from this medal is gold?

100 % ____ 115 g

71,5 % ____ 82.22 g

Molar mass of Au is 196.97 g/m

Mass / Molar mass = Moles

82.22 g / 196.97 g/m = 0.417 moles

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Given 50g of sodium how many moles do you have? ​
Anastaziya [24]

Answer:

Amount of Na = 2.17moles

Explanation:

Mass of Na = 50g

Molar mass of Na = 23g/mol

Amount of mole = mass/molar mass

Amount of mole = 50/23

Amount of mole = 2.17moles

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Combining Boyle's law and Charles' law forms one presure-temperature-volume relationship and holds the mass of the gas constant.
Oksanka [162]

(P1V1/T1)=(P2V2/T2)

I just took the test and this should be correct

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3 years ago
For double-helix formation, DG can be measured to be 2 54 kJ mol 1 ( 2 13 kcal mol 1 ) at pH 7.0 in 1 M NaCl at 25 8C (298 K). T
levacccp [35]

Answer:

ΔS = -661.0J/mol is the entropy change for the system

ΔS = -842J/mol.K is the entropy change for the surroundings

Explanation:

From the relationship between ΔG, T, ΔH and ΔS,

Mathematically, ΔG = ΔH - TΔS

TΔS = ΔH - ΔS

ΔS = ΔH - ΔS / T

but ΔG = -54 kJ/mol, ΔH = -251 kJ/mol and T = 25 °C (298 K)

plugging into the equation,

ΔS = -251 kJ/mol - ( -54 kJ/mol) / 298

ΔS  = -0.6610KJ/mol or in J.mol

ΔS = -661.0J/mol is the entropy change for the system

  • For entropy change for the surroundings = ΔS = ΔH/T
  • ΔS  = -251 kJ/mol / 298K
  • ΔS = -0.84KJ/mol.K or -842J/mol.K is the entropy change for the surroundings
8 0
3 years ago
Jose times how long sugar takes to dissolve in warm water. he conducts four trials of his experiment. what should he conclude fr
mylen [45]

He can conclude that his experiment has very low precision.

<h3>What is Precision ?</h3>

Precision is defined as the degree of refinement with which an operation is performed or a measurement .

Precision is how close the exact answers are together.

As, the answers are increasing in time.

None of the answers are similar to one another.

Hence, He can conclude that his experiment has very low precision.

Learn more about Precision here ;

brainly.com/question/27845433

#SPJ1

7 0
2 years ago
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