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4 years ago

Mg(s)+2HCl(aq) → MgCl2(aq)+H2(g)

Chemistry

1 answer:

Flura [38]4 years ago

8 0

Answer:

741 torr

0.81 moles of H2

Explanation:

Given the reaction equation;

Mg(s)+2HCl(aq) → MgCl2(aq)+H2(g)

We can obtain the pressure of the gas at 298 K using Dalton's law of partial pressures.

Pressure of gas + vapour pressure of water = 765 torr

vapour pressure of water = 24 torr

765 torr - vapour pressure of water = Pressure of gas

Pressure of gas = 765 torr - 24 torr = 741 torr

From the question we have;

number of moles of HCl reacted = Concentration * volume

number of moles of HCl reacted = 250/1000 * 6.44 = 1.61 moles

2 moles of HCl yields 1 mole of H2

1.61 moles of HCl yields 1.61 * 1/2 = 0.81 moles of H2

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The density of aluminum is 2.70 g/cm3. What is the mass of a solid piece of aluminum with a volume of 2.50 cm3?

blagie [28]

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 2.7 × 2.5

We have the final answer as

Hope this helps you

4 0

3 years ago

A sample of gas has a pressure of 1.8 atm and a volume of 2.5 L, what would be the pressure of this sample of gas if the volume

jek_recluse [69]

Boyle's Law
P1V1 = P2V2
1.8 atm * 2.5 L = P2 * 1.2 L
1.8 atm * 2.5 L / 1.2 L = P2
3.75 atm = P2
Using significant digits, the answer is 3.8 atm

3 0

3 years ago

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I need help name the parts of making up the female part of the flower and state what each part does. ( answer in your own unique

nekit [7.7K]

<h2>Answer:-</h2>

The female part is the pistil. The pistil usually is located in the center of the flower and is made up of three parts: the stigma, style, and ovary. The stigma is the sticky knob at the top of the pistil. It is attached to the long, tube like structure called the style.

6 0

3 years ago

Calculate the weight of 3.491 into 10 to the power 19 molecules of cl2

Rom4ik [11]

Answer:

The mass of 3.491 × 10¹⁹ molecules of Cl₂ of Cl₂ is 4.11 × 10⁻³ grams

Explanation:

The number of particles in one mole of a substance id=s given by the Avogadro's number which is approximately 6.023 × 10²³ particles

Therefore, we have;

One mole of Cl₂ gas, which is a compound, contains 6.023 × 10²³ individual molecules of Cl₂

3.491 × 10¹⁹ molecules of Cl₂ is equivalent to (3.491 × 10¹⁹)/(6.023 × 10²³) = 5.796 × 10⁻⁵ moles of Cl₂

The mass of one mole of Cl₂ = 70.906 g/mol

The mass of 5.796 × 10⁻⁵ moles of Cl₂ = 70.906 × 5.796 × 10^(-5) = 4.11 × 10⁻³ grams

Therefore;

The mass of 3.491 × 10¹⁹ molecules of Cl₂ of Cl₂ = 4.11 × 10⁻³ grams.

4 0

3 years ago

A buffer solution is prepared by adding NaC2H202

olganol [36]

Shift to reactants(left)

<h3>Further explanation </h3>

A buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.

The buffer solution can be acidic or basic

Acid buffer solutions consist of weak acids and their salts.

A buffer solution of NaC2H202 and HC2H2O2 (acetic acid) is included in the acid buffer

So :

a slight addition of acid (H⁺) will be balanced by the conjugate base

the addition of a small base (OH⁻) will be balanced by the weak acid

With the addition of acid (H +), the equilibrium will shift to the left, in the formation of CH3COOH. The added acid will be neutralized by the conjugate base component (CH3COO−).

7 0

3 years ago