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3 years ago

Question 4 of 5

Chemistry

2 answers:

alex41 [277]3 years ago

6 0

Answer:

<h3><u>Required Answer</u><u>:</u><u>-</u></h3>

First rewrite the sentence that defines the equation

Zinc (Zn) combines with hydrogen chloride (HCI) to form hydrogen gas(H2) and zinc chloride (ZnCl2).

<h3><u>Chemical</u><u> </u><u>Equation</u></h3>

$\sf Zinc+Hydrogen\:Chloride \longrightarrow Hydrogen\:gas+Zinc\:Chloride$

Now write the equation

$\sf Zn+HCL \longrightarrow H_2+ZnCl_2$

Balance

$\sf Zn+2HCL\longrightarrow H_2+ZnCl_2$

option C is correct

Ghella [55]3 years ago

4 0

Answer:

Explanation:

Answer is C

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Identify the "given" information and what the problem is asking you to "find."

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3 years ago

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3 years ago

MULTIPLE CHOICE QUESTION

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Shorter

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7 0

3 years ago

We add a 1.20-g sample of dry ice to a 755-mL flask containing nitrogen gas at a temperature of 25.0 C and a pressure of 725mmHg

yaroslaw [1]

Answer:

Total pressure is 1396 mmHg

Explanation:

By:

PV/RT = n

It is possible to obtain the initial moles of nitrogen gas, where:

P is pressure (725 mmHg = 0,954 atm)

V is volume (0,755L)

R is gas constant (0,082atmL/molK)

T is temperature (25,0°C = 298,15 K)

Replacing:

n = 0,02946 moles of nitrogen gas.

The moles of dry ice (CO₂; molar mass= 44,01 g/mol) are:

1,20 g × (1mol/44,01g) = 0,02727 moles of dry ice.

When dry ice sublimes, total moles are:

0,02727 + 0,02946 =<em> 0,05673 moles</em>

With the temperature (25,0°C = 298,15 K) and volume (0,755L) it is possible to obtain total pressure, thus:

P = nRT/V

Replacing:

P = 1,837 atm × (760 mmHg/1atm) = <em>1396 mmHg</em>

I hope it helps!

3 0

4 years ago