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Vera_Pavlovna [14]
2 years ago
5

Iday!' Read the following phrases from the article. 1. Full-scale war 2. Braces for a full invasion 3. Hostile act 4. Defenses o

n its eastern flank Why does the author use these words?
a. To call attention to Vladimir Putin's objective with the attack on Ukraine
b. To highlight the offensive steps taken by the Russian military
c to emphasize the heightened degree of military engagement
d. To document President Zelenskyy's aggressive approach to defending his country​
Chemistry
1 answer:
maria [59]2 years ago
7 0

Answer:

c.

Explanation:

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find the mass of h2 produced Binary compounds of alkali metals and hydrogen react with water to produce H2(g). The H2H2 from the
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Answer: Mass of hydrogen produced is 0.0376 g.

Explanation:

The reaction equation will be as follows.

NaH(aq) + H_{2}O(l) \rightarrow H_{2}(g) + NaOH(aq)

Now, formula for total pressure will be as follows.

  P_{total} = P_{H_{2}} + P_{H_{2}O}

Hence,    P_{H_{2}} = P_{total} - P_{H_{2}O}

                            = 755 mm Hg - 42.23 mm Hg

                            = 712.77 mm Hg

P_{H_{2}} = \frac{712.77 \times 1 atm}{760 mm Hg}

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Now, we will calculate the moles of H_{2} as follows.

   P_{H_{2}}V = nRT

   0.937 atm \times 0.505 L = n \times 0.0821 \times 308.15 K

      n = \frac{0.473}{25.29} mol

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Therefore, mass of H_{2} will be calculated as follows.

        m_{H_{2}} = \frac{0.0187 mol \times 2.0158 g}{1 mol}

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A sample of helium gas is heated from 20.0°C to 40.0°C. This
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C. 548mL

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