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Daniel [21]
3 years ago
8

How many milliliters of sodium metal, with a density of 0.97 g/mL, would be needed to produce 12.8 grams of hydrogen gas in the

single replacement reaction below? Show all steps of your calculation as well as the final answer.
unbalanced equation: Na + H2O -> NaOH + H2
Chemistry
1 answer:
Hatshy [7]3 years ago
4 0
The balanced chemical reaction is:

<span>2Na + 2H2O -> 2NaOH + H2
</span>
We are given the amount of hydrogen gas produced by the reaction. This amount will be the starting point for our calculations.

12.8 g H2 ( 1 mol H2/ 2.02 g H2) ( 2 mol Na / 1 mol H2) (22.99 g Na / 1 mol Na ) (1 mL / 0.97 g) = 606.75 mL Na is needed
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At 20.°C, a 1.2-gram sample of Mg ribbon reacts rapidly with 10.0 milliliters of 1.0 M HCl(aq). Which change in conditions would
Pavlova-9 [17]

Answer: (2) decreasing the concentration of HCl(aq) to 0.1 M

Explanation: Rate of a reaction depends on following factors:

1. Size of the solute particles: If the reactant molecules are present in smaller size, surface of particles and decreasing the size increases the surface area of the solute particles. Hence, increasing the rate of a reaction.  

2. Reactant concentration: The rate of the reaction is directly proportional to the concentration of reactants.

3. Temperature: Increasing the temperature increases the energy of the molecules and thus more molecules can react to give products and rate increases.

(1) Increasing the initial temperature to 25°C will increase the reaction rate.

(2) Decreasing the concentration of HCl(aq) to 0.1 M will decrease the reaction rate due to lesser concentration.

(3) Using 1.2 g of powdered Mg will increase the reaction rate due to large surface area.

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7 0
3 years ago
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What does the period number indicate on periodic table
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4 0
3 years ago
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Identify what kind of ligand (weak or strong), what kind of wavelength (long or short), what kind of spin (high spin or low spin
anzhelika [568]

To find - Identify what kind of ligand (weak or strong), what kind

              of wavelength (long or short), what kind of spin (high spin or

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              the following complexes.

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Step - by - Step Explanation -

1.

[Mn(CN)⁶]⁴⁻ :

Ligand - Strong

Wavelength - Short

Spin - Low spin

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2.

[Fe(OH)(H₂O)₅]²⁺ :

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Wavelength - Long

Spin - High spin

Number of unpaired electrons = 5 ∴ paramagnetic.

3.

[CrCl₄Br₂]³⁻ :

Ligand - Weak ( both Br⁻ and Cl⁻ )

Wavelength - Long

Spin - High spin

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