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3 years ago

2.15 Liters of helium gas at a pressure of 58 kPa and a temperature of 25 degrees celsius, what is the new volume at stp?

1 answer:

5 0

The ideal gas law is P1V1/T1 = P2V2/T2. STP means the temperature is 273 K and pressure is 101.3 kPa. According to this formula, the new volume V2=2.15*58*273/(298*101.3) = 1.13 L.

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The reaction of 2-methylcyclohexanone with CH3MgBr followed by neutralization gives two alcohols. These two alcohols are

Lilit [14]

The reaction of 2-methylcyclohexanone with CH3MgBr followed by neutralization gives two alcohols. These two alcohols are cyclohexanol and ethanol. This reaction involves Grignard reaction.

<h3>What is Grignard reaction?</h3>

Alkyl, allyl, vinyl, or aryl-magnesium halides (the Grignard reagent) are added to a carbonyl group in an aldehyde or ketone to produce the Grignard reaction. The creation of carbon-carbon bonds depends on this process.
An organic halide reacts with magnesium, but it does not undergo a Grignard reaction; instead, it produces a Grignard reagent.
The carbon bonded to magnesium acts as a nucleophile and targets the electrophilic carbon atom that is present within the polar bond of a carbonyl group because carbon is more electronegative than magnesium.
Usually, the Grignard reagent is added to the carbonyl through a six-membered ring transition state.

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7 0

1 year ago

10. Which substance does not take the shape of its container?

luda_lava [24]

Answer:

B. Air

Explanation:

5 0

3 years ago

Write the chemical equation of the reaction with a change in colour

Lelu [443]

Answer:

(i) Change in colour (ii) Change in temperature (iii) Formation of precipitate

Explanation:

(i) Change in colour: Reaction between lead nitrate solution and potassium iodide solution. Pb(NO3)2(aq)+2KI → PbI2(s)+2KNO3(aq) In this reaction, colour changes from colourless to yellow. (ii)Change in temperature: Action of dilute sulphuric acid on zinc. Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2 In this reaction, heat is evolved (iii) Formation of precipitate: Action of barium chloride on sodium sulphate. BaCl2(aq) +Na2SO4(aq) → BaSO4(s) +2NaCl(aq) BaSO4(s)

8 0

3 years ago

A 23.6 g sample of NagPO4 (molar mass 163.94 g/mol) is dissolved in enough water to produce

Gnom [1K]

Taking into account the definition of molarity, the concentration of Na₃PO₄ in solution is 0.192 $\frac{moles}{lliter}$ .

<h3>Definition of molarity</h3>

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

$Molarity=\frac{number of moles}{volume}$

Molarity is expressed in units $\frac{moles}{lliter}$ .

<h3>Concentration of Na₃PO₄ in solution</h3>

Being the molar mass of Na₃PO₄ 163.94 g/mole, that is, the amount of mass that a substance contains in one mole, the amount of moles that contains 23.6 g sample of Na₃PO₄ is calculated as:

$23.6 gramsx\frac{1 mole}{163.94 grams} = 0.144 moles$

Then you know:

number of moles= 0.144 moles
volume= 750 mL= 0.750 L (being 1000 mL= 1 L)

Replacing in the definition of molarity:

$Molarity=\frac{0.144 moles}{0.750 L}$

Solving:

Molarity= 0.192 $\frac{moles}{lliter}$

Finally, the concentration of Na₃PO₄ in solution is 0.192 $\frac{moles}{lliter}$ .

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8 0

2 years ago

What volume of a 0.303 m hydroiodic acid solution is required to neutralize 20.5 ml of a 0.167 m calcium hydroxide solution?

Ber [7]

First, we write the reaction equation:
2HCl + Ca(OH)₂ → CaCl₂ + H₂O

From this equation, we can see that two moles of HCl are required per mole of calcium hydroxide. Moreover, we know that moles, concentration and volume are related as:

Moles = molarity * liters
n = MV

2 * Moles of Ca(OH)₂ = Moles of HCl
2 * M₁ * V₁ = M₂ * V₂
2 * 0.167 * 0.0205 = 0.303 * V₂
V₂ = 0.02259 L

The volume required is 22.60 mL

4 0

4 years ago