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3 years ago

For a reversible reaction, it is likely that _____ is/are present at equilibrium. *

Chemistry

1 answer:

Nikolay [14]3 years ago

8 0

Answer:

both reactants and products

Explanation:

For a reversible reaction, it is likely that both reactants and products are present at equilibrium.

-TheUnknownScientist

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German,Prussian,Weimar,American,Swiss

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3 years ago

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An unknown metal sample has a mass : of 11.29. and a volume of 2 cm3. What is the : density of the unknown metal?

tatuchka [14]

Answer:

$\boxed{\sf Density \ of \ the \ unknown \ metal = 5.645 \ g/cm^3}$

Given:

Mass = 11.29 g

Volume = 2 cm³

To Find:

Density of unknown metal

Explanation:

Formula:

$\boxed{ \bold{Density = \frac{Mass}{Volume}}}$

Substituting value of mass & volume in the formula:

$\sf \implies Density = \frac{11.29}{2} \\ \\ \sf \implies Density = 5.645 \: g/cm^3$

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3 years ago

What is the molarity of SO4^2- in a solution prepared by mixing 2.17 g of alum, KAl(SO4)2•12H2O, with 175 mL of water? The molec

vodka [1.7K]

Answer: The concentration of sulfate ions in the solution is 0.0522 M

Explanation:

To calculate the the molarity of solution:, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}$

Given mass of alum = 2.17 g

Molar mass of alum = 478.39 g/mol

Volume of solution = 175 mL

Putting values in above equation, we get:

$\text{Molarity of solution}=\frac{2.17\times 1000}{474.39\times 175}\\\\\text{Molarity of solution}=0.0261M$

The chemical equation for the ionization of alum follows:

$KAl(SO_4)_2.12H_2O\rightarrow K^++Al^{3+}+2SO_4^{2-}+12H_2O$

1 mole of alum produces 1 mole of potassium ions, 1 mole of aluminium ions, 2 moles of sulfate ions and 12 moles of water

So, concentration of sulfate ions = $(2\times 0.0261)=0.0522M$

Hence, the concentration of sulfate ions in the solution is 0.0522 M

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