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2 years ago

The graph shows a sample of gas when it is hot, cold, and at room temperature.

Chemistry

1 answer:

AveGali [126]2 years ago

3 0

Answer:

B represents gas at room temperature and C represents hot gas.

Explanation:

<em>As the temperature increases, the no. of particles that has higher energy increases.</em>

So, A represents the cold gas, because it has the lowest no. of particles that has high energy.

B represents the gas at room T because it has more no. of particles with higher energy.

C represents the hot gas, because it is the curve that has the highest no. of particles with high energy.

So, the right choice is:

<em>B represents gas at room temperature and C represents hot gas.</em>

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Salicylic acid (C4H603) reacts with acetic anhydride (C«H603) to form acetylsalicylic acid (C9H30.).

Vinvika [58]

The limiting reactant is salicylic acid (C₇H₆O₃).

Explanation:

We have the following chemical reaction where salicylic acid (C₇H₆O₃) reacts with acetic anhydride (C₄H₆O₃) to form acetylsalicylic acid (C₉H₈O₄) and acetic acid (C₂H₄O₂):

C₇H₆O₃ + C₄H₆O₃ → C₉H₈O₄ + C₂H₄O₂

We have started with 70.0 g of salicylic acid (C₇H₆O₃) and 80.0 g acetic anhydride (C₄H₆O₃).

First we calculate the number of moles of each reactant:

number of moles = mass / molar weight

number of moles of salicylic acid = 70 / 138 = 0.507 moles

number of moles of acetic anhydride = 80 / 102 = 0.784 moles

We see from the chemical reaction that 1 mole of acetic anhydride (C₄H₆O₃) reacts with 1 mole of salicylic acid (C₇H₆O₃) so 0.784 moles of acetic anhydride (C₄H₆O₃) will react with 0.784 mole of salicylic acid (C₇H₆O₃) but we only have 0.507 moles of salicylic acid (C₇H₆O₃). The limiting reactant is salicylic acid (C₇H₆O₃).

Learn more about:

limiting reactant

brainly.com/question/14124321

#learnwithBrainly

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2 years ago

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Ludmilka [50]

Answer:

3 × 10¹⁰⁹

Explanation:

2Cr (s) → 2Cr³⁺ + 6e⁻

and,

Ec° for the above reaction = 0.74 V

also,

3Cu²⁺ (aq) + 6e⁻ → 3Cu(s)

and,

Ea° for the above reaction = 0.34 V

Now,

The cell potential, E° = 0.34 + 0.74 = 1.08

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