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ch4aika [34]
3 years ago
7

Calculate the change in temperature (ΔT) that occurs when 8000 J of energy (q) is used to heat up a mass (m) of 75 g of water. (

you already know the value of the specific heat of water, C) (round your answer to the nearest whole number)
Chemistry
2 answers:
pickupchik [31]3 years ago
8 0

Answer:

The change in temperature that occurs when 8000 J of heat is used by a mass 75 g of water is 25.4 °C

Explanation:

H = mc ΔT

m = 75 g

c = 4. 200 J/ g °C

H = 8000 J

ΔT =?

Rearranging the formula, making ΔT the subject of formula;

ΔT = H / m c

ΔT = 8000 / 75 * 4.200

ΔT = 8000 / 315

ΔT = 25.4 °C

mojhsa [17]3 years ago
4 0

Answer:

The change in temperature ΔT that occurs when 8000 J of energy (q) is used to heat up a mass (m) of 75 g of water is 25°C

Explanation:

The formula for change in heat supplied to a body is given as follows;

ΔH = m·C·ΔT

Where:

ΔH = Heat supplied to the body = 8000J

m = Mass of the body = 75 g

ΔT = T_{(Final)} - T_{(Initial)} = Temperature change experienced by the body

c = Specific heat capacity of water = 4.186 J/g

Therefore, 8000 J = 75 g × 4.186 J/(g·°C) × ΔT

Therefore;

\Delta T = \frac{8000 \, J }{75 \, g \times 4.186 \, J/(g\cdot ^{\circ}C) } = 25.48 ^{\circ}C

Hence the change in temperature ΔT that occurs when 8000 J of energy (q) is used to heat up a mass (m) of 75 g of water rounded to the nearest whole number = 25°C.

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Using the average initial pH of your acetic acid solutions (2.96), and the average molarity of those solutions(.0602), calculate
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Answer : The value of Ka for acetic acid is,  2.03\times 10^{-5}

Explanation :

The chemical formula of acetic acid is, CH_3COOH.

The chemical equilibrium reaction will be:

CH_3COOH\rightleftharpoons CH_3COO^-+H^+

Given:

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[H^+]=1.096\times 10^{-3}M

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[H^+]=[CH_3COO^-]=1.096\times 10^{-3}M

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The expression for reaction is:

K_a=\frac{[CH_3COO^-][H^+]}{[CH_3COOH]}

K_a=\frac{(1.096\times 10^{-3})\times (1.096\times 10^{-3})}{0.0591}

K_a=2.03\times 10^{-5}

Thus, the value of Ka for acetic acid is,  2.03\times 10^{-5}

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a chemist adds of a calcium bromide solution to a reaction flask. calculate the mass in grams of calcium bromide the chemist has
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<h3>What is Molarity? </h3>

Molarity is defined as the ratio of number of moles od solute to the number of volume of solution in litres.

Molarity = number of moles/ volume

<h3>Calculation of Moles</h3>

Number of moles = Molarity × volume

Given,

Molarity of Calcium bromide = 0.363 M

Volume of Calcium bromide = 410 mL

= 0.410L

By substituting all the value, we get

Number of moles = 0.363 × 0.410

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As we know that,

Molar mass of Calcium bromide = 199.89 g

<h3>What is Mole? </h3>

Mole is defined as the given mass of substance to the molar mass of substance.

Given mass = Moles × Molar mass

= 0.148 × 199.89

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= 29.7 g (significant digit)

Thus, we calculated that the mass of Calcium bromide added in the flask is 29.7 g.

learn more about Molarity:

brainly.com/question/19517011

#SPJ4

DISCLAIMER:

The above question is incomplete. Below is the complete question

A chemist adds 410.0mL of a 0.363 M calcium bromide solution to a reaction flask. calculate the mass in grams of calcium bromide the chemist has added to the flask. round your answer to 3 significant digits.

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