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Vlada [557]
3 years ago
14

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

reaction of a sample of NaH with an excess of water fills a volume of 0.505 L above the water. The temperature of the gas is 35 ∘C∘C and the total pressure is 755 mmHg
Chemistry
1 answer:
scZoUnD [109]3 years ago
7 0

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}

             = 0.937 atm

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

         = 0.0187 mol

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

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

                   = 0.0376 g

Thus, we can conclude that mass of hydrogen produced is 0.0376 g.

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Answer:

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Explanation:

The percentage concentration in w/v of the phenylephrine hydrochloride can be calculated as follows:

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Where:

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The concentration of the phenylephrine hydrochloride is 10 mg/mL, so the percentage concentration is:

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I hope it helps you!

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