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loris [4]
3 years ago
14

Consider the following balanced chemical equation, KCl(aq) AgNO3(aq) → AgCl(s) KNO3(aq)When a sample of impure potassium chlorid

e (0.900 g) was dissolved in water, and treated with excess silver nitrate (AgNO3), 1.26 g of silver chloride (AgCl) was precipitated. Calculate the percentage KCl in the original sample.
Chemistry
1 answer:
stiks02 [169]3 years ago
5 0

Answer:

In the original sample there's 72.78% KCl

Explanation:

KCl(aq) + AgNO₃(aq) → AgCl(s) + KNO₃(aq)

  • To solve this problem we need to calculate the mass of <em>pure</em> potasssium chloride. To do that we calculate the moles of KCl that reacted into AgCl:

1.26 g AgCl * \frac{1molAgCl}{143.32gAgCl}*\frac{1molKCl}{1molAgCl} = 8.792 *10^{-3} molKCl

  • Now with the molecular weight of KCl, we can calculate the mass of KCl that reacted:

8.792 * 10⁻³ mol KCl * 74.55 g/mol = 0.655 g KCl

  • Finally we divide the mass of <em>pure</em> KCl by the mass of the sample, to calculate the percentage KCl:

0.655 / 0.900 * 100% = 72.78%

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Sally has constructed a concentration cell to measure Ksp for MCln. She constructs the cell by adding 2 mL of 0.05 M M(NO3)n to
hram777 [196]

Answer:

0.1056 mole

Explanation:

As Sally knows that the charge on the metal ion is n = +2

$MCl_n=MCl_2$

In that compartment $[M^{n+}]=[m^{2+}]=8.279 \ M$

The volume of the $MCl_n$ taken in that compartment = 6.380 mL

So, the number of moles of $M^{2+} = 8.279 \times 6.380$

                                                      = 52.82 m mol

                                                      = 0.05280 mol

$MCl_n \rightarrow M^{n+}+nCl^-$

But n = 2

Therefore, moles of $Cl^-$ = 2 x moles of $M^{n+}$

                                       = 2 x 0.05282

                                       = 0.1056 mole

3 0
2 years ago
What is the difference between polyatomic and monatomic compounds??
Klio2033 [76]

Answer:

Monatomic ions are made up of only one atom per ion, whereas polyatomic ions are made up of numerous atoms per ion.

Explanation:

6 0
2 years ago
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What is the term for an irregular way a mineral breaks apart?
kari74 [83]

Answer:

That would be fracture

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A way that a mineral breaks apart curved at  the edges or split into uneven pieces

6 0
3 years ago
What is the standard enthalpy of a reaction for which the equilibrium constant is (a) doubled, (b) halved when the temperature i
Alexxandr [17]

Answer:

a) 48KJ

b) -48KJ

Explanation:

Given that;

ln(K2/K1) = ΔH°/R(1/T2 - 1/T1)

K2= equilibrium constant at T2

K1 = equilibrum constant at T1

R = gas constant

T1 = initial temperature

T2 = final temperature

When we double the equilibrium constant K1; K2 = 2K1

T1 = 310 K

T2 = 310 + 15 = 325 K

ln(2K1/K1) =- ΔH°/R(1/T2 - 1/T1)

ln2 = -ΔH°/8.314(1/325 - 1/310)

0.693 = -ΔH°/8.314(3.08 * 10^-3 - 3.2 * 10^-3)

0.693 = -ΔH°/8.314 (-0.00012)

0.693 = 0.00012ΔH°/8.314

0.693 * 8.314 = 0.00012ΔH°

ΔH° = 0.693 * 8.314/0.00012

ΔH° = 48KJ

b) K2 =K1/2

ln(K1/2/K1) =- ΔH°/R(1/T2 - 1/T1)

ln (1/2) = -ΔH°/8.314 (1/325 - 1/310)

-0.693 = -ΔH°/8.314  (-0.00012)

-0.693 = 0.00012ΔH°/8.314

-0.693 * 8.314 = 0.00012ΔH°

ΔH°= -0.693 * 8.314/0.00012

ΔH°= -48KJ

6 0
3 years ago
How many valence electrons can atoms of non metals have?
Dmitry_Shevchenko [17]

1 to 8 valence electrons

7 0
3 years ago
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