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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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cestrela7 [59]

Answer:

  • <em>Option D. temperature</em>

Explanation:

Indeed it is generally established that <em>temperature is a measure of the kinetic energy ot the particles</em>.

The <em>kinetic energy</em> of a particle is proportional to the product of the mass and the square of the speed. Mathematically, the kinetic energy, KE, is:

  • KE = (1/2) m × v²

Where m is the mass and v the speed of the particle.

In a sample of matter, not all the particles have the same speed, hence not all the particles have the same kinetic energy.

The kinetic energy and the temperature are related by the Boltzman equation:

  • KE = (3/2)KT

Where K is a constant (Boltzman constant) and T is the absolute temperature.

Therefore, as you can see from the last equation, <em>the temperaure is a measure of the averate kinetic energy of the particles in a sample of matter</em>.

This is, at a certain temperature, every substance has the same average kinetic energy.

7 0
3 years ago
What is the percent by mass (mv) of a solution with 1.56 g of benzene dissolved in gasoline to make 998.44 mL of solution? (dens
Marina CMI [18]

Answer:

The percentage by mass of benzene in the solution is approximately 0.2%

Explanation:

The given parameters are;

The mass of the benzene solute dissolved in the gasoline solvent, m₁ = 1.56 g

The total volume of the benzene gasoline solution made, V = 998.44 mL

The density of gasoline, ρ = 0.7489 g/mL

Mass, m = Density, ρ × Volume, V

∴ The mass of gasoline in the 998.44 mL, solution = 0.7489 g/mL × 998.44 mL = 747.731716 g

The total mass of the solution = The mass of the benzene in the solution + The mass of the gasoline in the solution

∴ The total mass of the solution = 747.731716 g + 1.5 g = 749.231716 g

The \ percentage \  by \  mass = \dfrac{The  \  mass \   of \   a  \  fraction}{(The  \  mass  \  of  \  the  \  total  \  solution)} \times  100

The percentage by mass of benzene in the solution = (1.5 g/749.231716 g)×100 ≈ 0.2% by mass.

6 0
3 years ago
True or False: The closer the particles pack together, the less permeable<br> the soil is *
MArishka [77]

Answer:

True

Explanation:

Tighter particle compaction means less movement between particles for other substances to move through

permeable

(of a material or membrane) allowing liquids or gases to pass through it.

7 0
3 years ago
A 845 mL NaCl solution is diluted to a volume of 1.19 L and a concentration of 6.00 M . What was the initial concentration? Expr
marysya [2.9K]

The initial concentration was 8.45M

Step 1: Given data

Initial concentration (C₁): ?

Initial volume (V₁): 635 mL = 0.845 L

Final concentration (C₂): 6.00 M

Final volume (V₂): 1.19 L

Step 2: Calculate the initial concentration

We have a concentrated NaCl solution and we want to prepare a diluted one. We will use the dilution rule.

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C₁ = C₂ × V₂  / V₁

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C₁ = 8.45 M

Thus, The initial concentration was 8.45M

Learn more about concentration here:

brainly.com/question/10725862

#SPJ4

7 0
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How many significant figures are in the measurement, 0.005890 g?
pantera1 [17]

4 significant figures. Use a rule called the Atlantic-Pacific rule where if the period is absent (Atlantic), you would start counting the numbers from right to left. If the period is present (Pacific), then start counting the numbers from left to right. Since the period is present, start from 5 and there are 4 digits including 5.

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