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vladimir2022 [97]
3 years ago
13

A piece of sodium metal undergoes complete reaction

Chemistry
1 answer:
Salsk061 [2.6K]3 years ago
4 0

Answer:

(a) Equation of reaction:

2Na + 2H20 = 2NaOH + H2

(b) 0.46g of sodium was used in the reaction

Explanation:

(a) 2 moles of sodium reacted with 2 moles of water to yield 2 moles of sodium hydroxide and 1 mole of hydrogen gas

(b) mass of hydrogen gas produced (m) = PVM/RT

P = 101.3kpa = 1atm, V = 246mL = 246cm^3, M = 2g/mol, R = 82.057cm^3.atm/gmol.K, T = 25°C = 25+273 = 298K

m = (1×246×2)/(82.057×298) = 0.02g of hydrogen gas

From the equation of reaction

2 moles (46g) of sodium produced 1 mole (2g) of hydrogen gas

0.02g of hydrogen gas was produced by (46×0.02)/2 = 0.46g of sodium

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A mixture of crystals of salt and sugar is added to water and stirred until all solids have dissolved. Which statement best desc
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Read 2 more answers
A diffusion coefficient KG was determined for the diffusion of a gas A through a stagnant film B [KG = 0.88 mol//h-ft2-atm].
Angelina_Jolie [31]

Explanation:

Transfer of mass A into stagnant film B depends on the availability of driving force.

Whereas driving force is the pressure difference at the surface of A and the bulk.

As,       N_{A} \propto (P_{A1} - P_{A2})

           N_{A} = K_{G} \times (P_{A1} - P_{A2})

Therefore, putting the given values into the above formula as follows.

         N_{A} = K_{G} \times (P_{A1} - P_{A2})

                     = 0.88 \times (0.2 atm - 0.05 atm)

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4 0
4 years ago
6.02 x 1023<br> Significant figures
Bond [772]

Answer:

It depends on the number of significant figures you are changing to

Explanation:

6.02×1023=6158.46

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4 sig fig = 6158

5 sig fig = 6158.5

6 sig fig = 6158.46

When solving significant figures you have to consider the number after each number like in the case of changing to two sig fig the number following one is five and when the number is up to or greater than five you add a value of one to the number before it. But in a case where the number is less than five you just leave it like that like in the case of changing to one sig fig

3 0
3 years ago
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