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3 years ago

2. A quantity of 1.922g of methanol (CH3OH) was burned in a constant-volume

1 answer:

5 0

Mass of methanol (CH3OH) = 1.922 g
Change in Temperature (t) = 4.20°C
Heat capacity of the bomb plus water = 10.4 KJ/oC
The heat absorbed by the bomb and water is equal to the product of the heat capacity and the temperature change.
Let’s assume that no heat is lost to the surroundings. First, let’s calculate the heat changes in the calorimeter. This is calculated using the formula shown below:
qcal = Ccalt
Where, qcal = heat of reaction
Ccal = heat capacity of calorimeter
t = change in temperature of the sample
Now, let’s calculate qcal:
qcal = (10.4 kJ/°C)(4.20°C)
= 43.68 kJ
Always qsys = qcal + qrxn = 0,
qrxn = -43.68 kJ
The heat change of the reaction is - 43.68 kJ which is the heat released by the combustion of 1.922 g of CH3OH. Therefore, the conversion factor is:

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A water bath in a physical chemistry lab is 1.85m long, 0.810m wide and 0.740m deep. If it is filled to within 2.57 in from the

jenyasd209 [6]

Answer:

The volume of water in water bath is 1,011 Liters.

Explanation:

Length of the water bath, L = 1.85 m

Width of the water bath, W= 0.810 m

Height of the water bath ,H= 0.740 m

Height of the water in water bath, h= 0.740 m - 2.57 inches

1 m = 39.37 inch

$= 0.740 m - \frac{2.57}{39.37} m = 0.6747 m$

Volume of the water in bath = L × W × h

$=1.85 m\times 0.810 m\times 0.6747 m=1.011 m^3$

$1 m^3=1000 L$

$1.011 m^3=1.011\times 1000 L=1,011 L$

The volume of water in water bath is 1,011 Liters.

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4 years ago

Complete them with correct formulas Then balance them

otez555 [7]

Answer:

1. 2Ca + N $_{2}$ → 2CaN

2. 4Li + O $_{2}$ → 2Li $_{2}$ O

3. 2KCl + BaF $_2$ → 2KF + BaCl $_2$

4. CH $_4$ + 2O $_2$ → CO $_2$ + 2H $_2$ O

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3 years ago

Will upvote

damaskus [11]

I believe the correct answer from the choices listed above is the third option. A ball falling through the air has both potential energy because it still has a distance to move before it hits the ground and kinetic energy because it is moving. Hope this answers the question. Have a nice day.

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3 years ago

The ph of a fruit juice is 2.2 . find the hydronium ion concentration, left bracket upper h 3 upper o superscript plus right br

patriot [66]

Answer:

[H₃O⁺] = 6.31 x 10⁻³ M.

Explanation:

To find the hydronium ion concentration [H₃O⁺], we can use the relation:

pH = - log[H₃O⁺].

∴ 2.2 = - log[H₃O⁺].

∴ log[H₃O⁺] = - 2.2

∴ [H₃O⁺] = 6.31 x 10⁻³ M.

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3 years ago

What is oxidized and what is reduced in this reaction?

sineoko [7]

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N is oxidized and O is reduced

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3 years ago