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yuradex [85]
3 years ago
11

.22

Chemistry
2 answers:
Alja [10]3 years ago
7 0

Answer:its b

Explanation:

andriy [413]3 years ago
5 0

Answer:

(a)  

First, write the balanced equation as follows:

Na2S(aq) + ZnCl2(aq) -> 2 NaCl(aq) + ZnS  (s)

Then, rewrite the equation so that all dissolved compounds are separated into their constituted ions. This is called, total ionic equation:

2 Na^+(aq) + S^{2-}(aq) + Zn^{2+}(aq) + 2 Cl^-(aq) -> ZnS (s) + 2 Na^+(aq) + 2 Cl^-(aq)

Finally, cancel the ions that appear both in reactants and products. This is called, net ionic equation:

S^{2-}(aq) + Zn^{2+}(aq) -> ZnS (s)

(b)

Balanced equation:

2 K3PO4(aq) + 3Sr(NO3)2(aq) -> Sr3(PO4)2 (s) + 6 KNO3 (aq)

Total ionic equation:

6 K^+(aq) + 2 PO_4^{3-} (aq) + 3 Sr^{2-} (aq) + 6 NO_3^- (aq) -> Sr3(PO4)2 (s) + 6 K^+(aq) + 6 NO_3^- (aq)

Net ionic equation:

2 PO_4^{3-} (aq) + 3 Sr^{2-} (aq) -> Sr3(PO4)2 (s)

(c)

Balanced equation:

Mg(NO3)2(aq) + 2NaOH(aq) -> Mg(OH)2 (s) + 2 NaNO3 (aq)

Total ionic equation:

Mg^{2+} (aq) + 2 NO_3^- (aq) + 2 Na^+ (aq) + 2 OH^- (aq) -> Mg(OH)_2 (s) + 2 NO_3^- (aq) + 2 Na^+ (aq)

Net ionic equation:

Mg^{2+} (aq) + 2 OH^- (aq) -> Mg(OH)_2 (s)

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<u>Answer:</u> The final temperature of the coffee is 43.9°C

<u>Explanation:</u>

To calculate the final temperature, we use the equation:

q=mC(T_2-T_1)

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C = specific heat capacity of water = 4.184 J/g°C

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Putting values in above equation, we get:

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Hence, the final temperature of the coffee is 43.9°C

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3 years ago
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#16

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