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3 years ago

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Chemistry

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Ket [755]3 years ago

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A chemist weighs out 0.0865 g of sulfurous acid, H2SO3, which is a diprotic acid into a 250. mL of volumetric flask and dilutes

kobusy [5.1K]

<u>Answer:</u> The volume of NaOH needed to add is 12.35 mL

<u>Explanation:</u>

To calculate 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 sulfurous acid = 0.0865 g

Molar mass of sulfurous acid = 82.079 g/mol

Volume of solution = 250 mL

Putting values in above equation, we get:

$\text{Molarity of sulfurous acid}=\frac{0.0865\times 1000}{82.079\times 250}\\\\\text{Molarity of sulfurous acid}=0.0042M$

To calculate the volume of base, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $H_2SO_3$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=2\\M_1=0.0042M\\V_1=250mL\\n_2=1\\M_2=0.1700M\\V_2=?mL$

Putting values in above equation, we get:

$2\times 0.0042\times 250=1\times 0.1700\times V_2\\\\V_2=\frac{2\times 0.0042\times 250}{1\times 0.1700}=12.35mL$

Hence, the volume of NaOH needed to add is 12.35 mL

3 0

4 years ago

What is the binding energy of a mole of nuclei with a mass defect of 0.00084 kg/mol?

Alik [6]

Answer:

The binding energy of a mole of the nuclei is 252KJ

Explanation:

The binding energy is the amount of energy required to separate an atom into its nuclei.

From Einstein's relations,

E = Δm $c^{2}$

where E is the energy, Δm is the mass defect and c is the speed.

The mole of nuclei moves with the speed of light, so that;

c = 3.0 × $10^{8}$ m/s

Given that Δm = 0.00084Kg/mol, the binding energy is calculated as;

E = 0.00084 × 3.0 × $10^{8}$

= 252000

= 252KJ

The binding energy of a mole of the nuclei is 252KJ.

6 0

3 years ago

Read 2 more answers

The variable n represents

Vika [28.1K]

C is the correct answer

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3 years ago

Which statements are true of fossil fuels?

Arisa [49]

Letters A and B are correct because burning fossil fuels can harm the atmosphere through the greenhouse effect and contribute to global warming, and can sometimes spill into the water and harm the environment.

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3 years ago

What is the simple sugar resulting from the hydrolysis of lactose?

garri49 [273]

Glucose and galactose (both simple sugars) are produced from the hydrolysis of lactose.

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4 years ago

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