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2 years ago

Select the chemical equation below that is balanced

Chemistry

1 answer:

denis23 [38]2 years ago

6 0

Answer:

cucl⁴
h2o4
5 hco4
kso4(nh4)

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Consider the following intermediate chemical equations.(IMAGE) -205.7 kJ -113.4 kJ -14.3 kJ 78.0 kJ

andrey2020 [161]

Answer:

Approximately $-205.7\; \rm kJ$ .

Explanation:

This question can be solved using Hess's Law.

Start by considering: how can the first three reactions (with known $\Delta H$ values) be combined to produce the reaction $\rm CH_4\; (g) + 4\; \rm Cl_2\; (g) \to CCl_4\; (g) + 4\; HCl\; (g)$ ?

Here's one possible combination:

Include the first reaction once, without inverting.
Invert the second reaction and include it once.
Include the third reaction after multiplying all its coefficients by two.

In other words, if $(1)$ , $(2)$ , and $(3)$ denote the three reactions with know $\Delta H$ values, respectively, then $1 \times (1) - 1 \times (2) + 2\times (3)$ will give the required reaction $\rm CH_4\; (g) + 4\; \rm Cl_2\; (g) \to CCl_4\; (g) + 4\; HCl\; (g)$ .

By Hess's Law, the $\Delta H$ value of the reaction $\rm CH_4\; (g) + 4\; \rm Cl_2\; (g) \to CCl_4\; (g) + 4\; HCl\; (g)$ will thus be:

$\begin{aligned}&1 \times \Delta H_1 - 1\times \Delta H_2 + 2\times \Delta H_3\\ &= 1 \times 74.6\; \rm kJ - 1 \times 95.7\; \rm kJ +2 \times (-92.3\; \rm kJ) \\ &= -205.7\; \rm kJ\end{aligned}$ .

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Which one of the following represents a<br> chemical change?

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Balance and state of the reactions are precipitation, acid/base, or oxidation/reduction reactions.

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20 POINTS!

11Alexandr11 [23.1K]

Answer:

Explanation:

N₂O₄

Nitrogen tetroxide.

SO₃

Sulfur trioxide

Nitrogen monoxide

NO₂

nitrogen dioxide

As₂O₅

Arsenic pentoxide

PCl₃

Phosphorus trichloride

CCl₄

Carbon tetrachloride or tetrachloromethane

H₂O

Water

SeF₆

Selenium hexafluoride. Six fluorine atoms are attached with selenium atom.

N₂O₄

Dinitrogen tetroxide. It is reddish-brown liquid.

SO₃

Sulfur trioxide

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4 years ago

Describe the main properties of a gas. check all that apply

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