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bezimeni [28]
3 years ago
9

Toluene, C7H8, is used in the manufacture of explosives such as TNT (trinitrotoluene). A 1.500 g sample of liquid toluene was pl

aced in a bomb calorimeter along with excess oxygen. When the combustion of the toluene was initiated, the temperature of the calorimeter rose from 25.000 °C to 26.413 °C. The products of the combustion were CO2(g) and H2O(l), and the heat capacity of the calorimeter was 45.06 kJ °C−1 . Write the balanced chemical equation for the reation in the calorimeter.
Chemistry
1 answer:
stealth61 [152]3 years ago
8 0

Answer:

The answer to your question is      C₇H₈  +    9O₂   ⇒   7CO₂  +   4H₂O

Explanation:

Data

Toluene   C₇H₈

mass = 1500 g

Excess Oxygen

Temperature 1 = 25°C

Temperature 2 = 26.413°C

Products CO₂ and H₂O

Heat capacity = 45.06 kJ/°C

Balanced chemical equation

            Toluene  +  Oxygen  ⇒   Carbon dioxide  +  Water

                    C₇H₈  +    O₂   ⇒   CO₂  +   H₂O

                 Reactants       Elements     Products

                        7               Carbon               1

                        8               Hydrogen          2

                        2               Oxygen              3

This reaction is unbalanced

                   C₇H₈  +    9O₂   ⇒   7CO₂  +   4H₂O

                 Reactants       Elements     Products

                        7               Carbon               7

                        8               Hydrogen          8

                       18               Oxygen              18

Now, the reaction is balanced

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Two solutions are created by mixing one solution containing lithium nitrate with one containing sodium phosphate.
babunello [35]

Answer:

Solution A that will form a precipitate with Ksp = 2.3 x 10−4

Explanation:

                                  Li₃PO₄ ⇄ 3 Li⁺(aq) + PO₄³⁻(aq)

                                                     3S               S

Where S = Solubility(mole/lit) and Ksp = Solubility product

⇒ Ksp = (3S)³ x (S)

⇒ 27S⁴ = 2.3x10−4

⇒ S = 0.05 mol/lit

Concentration of Li₃PO₄ precipitate = 0.05

<u>Solution A </u>

0.500 lit of a 0.3 molar LiNO₃ contains 0.5 x 0.3 = 0.15 mole

0.4 lit of a 0.2 molar Na₃PO₄ contains = 3 x 0.4 x 0.2 = 0.24 mole

                                     3 LiNO₃ + Na₃PO₄ → 3 NaNO₃ + Li₃PO₄

(Mole/Stoichiometry)    \frac{0.15}{3}                \frac{0.24}{1}

                                   = 0.05            = 0.24

Since from (Mole/Stoichiometry) ratio we can conclude that LiNO₃ is limiting reagent.

So concentration of Li₃PO₄ is equal to 0.05.

                       

6 0
2 years ago
Which of the following is true about most predators? (Select all that apply.)
-Dominant- [34]

Answer:

select all of them except they are the biggest

3 0
2 years ago
HELPPPP ANSWERSS!!!<br><br> A. <br> 13<br><br> B. <br> 8<br><br> C. <br> 15<br><br> D. <br> 5
KATRIN_1 [288]

Answer:

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4 0
2 years ago
How many grams of C6H12O6 are needed to be dissolved in water to make 100. grams of a 250. ppm solution?
Vesna [10]

Answer:

0.025 g C6H12O6

Explanation:

ppm = (g solute/ g solution)* 10^6

g solute= (ppm * g solution)/ 10^6

g solute = (250 ppm * 100 g)/10^6

g solute=0.025 g C6H12O6

4 0
3 years ago
How does the reactivity of nonmetals change as you move from left to right across the periodic table?
Rudiy27

Answer:

Metallic character refers to the level of reactivity of a metal. Non-metallic character relates to the tendency to accept electrons during chemical reactions. Metallic tendency increases going down a group. Non-metallic tendency increases going from left to right across the periodic table.

Explanation:

I hope this helps :)

4 0
2 years ago
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