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4 years ago

The final temperature of the water mixture if no heat is lost?

Chemistry

1 answer:

Anestetic [448]4 years ago

8 0

The final temperature of the water mixture is 297 K.

Explanation:

It is said in the question that no heat is lost so we can conclude that heat lost is equal to heat absorbed by the sample.

The heat energy absorbed or lost can be calculated from the equation:

q=m.c. change in temperature

q= heat gain or loss

m = mass of the sample

c= specific heat of the substance

change in temperature

Heat loss will be equal to heat gain as the temperature difference is large between the samples.

-Δt Heat loss =Δ heat gain

So by comparing the heat absorbed or lost.

mhot. c.Δt hot= mcold.c.Δt cold

-0.526. 2.01.(ΔTf- 446) = 4.186. 4.18.(ΔTf-288)

-1.0572ΔTf+ 471.53= 17.49 ΔT- 5039.27

ΔTf= 297K

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How many atoms are in 24.6 moles of carbon?

alina1380 [7]

Answer: There are $148.1412\times 10^{23}$ atoms of carbon in the given moles.

Explanation:

We are given 24.6 moles of carbon and we need to find the number of atoms.

According to mole concept:

1 mole of an element contains $6.022\times 10^{23}$ number of atoms.

So, 24.6 moles of carbon will contain $24.6\times 6.022\times 10^{23}=148.1412\times 10^{23}$ atoms.

Hence, there are $148.1412\times 10^{23}$ atoms of carbon in the 24.6 moles of carbon.

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3 years ago

Calculate the pH of the solution that results when 20 mL of 0.2M HCOOH is mixed with 25mL of 0.2M NaOH solution.(post-equivalenc

Paul [167]

The pH of the solution : 12

<h3>Further explanation</h3>

Reaction

HCOOH + NaOH ⇒ HCOONa + H₂O

mol HCOOH =

$\tt 20~ml\times 0.2~M=4~mlmol$

mol NaOH =

$\tt 25~ml\times 0.2~M=5~mlmol$

Mol NaOH>mol HCOOH ⇒ at the end of the reaction there will be a strong base remains from mol NaOH, so that the pH is determined from [OH⁻]

ICE method :

HCOOH + NaOH ⇒ HCOONa + H₂O

4 5

4 4 4 4

0 1 1 1

Concentration of [OH⁻] from NaOH :

$\tt \dfrac{1~mlmol}{20+25~ml}=0.02$

pOH=-log[OH⁻]

pOH=-log 10⁻²=2

pH+pOH=14

pH=14-2=12

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3 years ago

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zhuklara [117]

Answer:

a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.

Explanation:

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I got you bro :)

Sorry he took your points :(

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