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Advocard [28]
4 years ago
12

In the following experiment, a coffee-cup calorimeter containing 100 g of H2O is used. The initial temperature of the calorimete

r is 23.0 oC. If 3.3 g of CaCl2is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? Assume that the heat capacity of the solution is 4.18 J/goC, and that the heat capacity of the calorimeter is negligible. The heat of dissolution ΔHsoln of CaCl2 is −82.8 kJ/mol.
Chemistry
1 answer:
AysviL [449]4 years ago
8 0

Answer:

The final temperature of the solution in the calorimeter is 28,7°C

Explanation:

A -ΔH means that when you dissolve CaCl₂ you will produce heat. This heat you produce is:

3,3g CaCl₂×\frac{1 molCaCl_{2}}{110,98g}×82800J/mol = 2462,1 J

The specific heat capacity of solution is:

q = c×m×ΔT

Where q is energy: (2462,1J)

c is heat capacity of the solution (4,18J/g°C)

m is mass of solution (103,3g)

And ΔT is (T-23°C)

Solving for T:

T = 23C+\frac{2462,1J}{4,18J/gC*103,3g}

T = 28,7°C

I hope it helps!

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Convert 99.0 g Se to moles Se.
Elenna [48]

Answer:

About 1.254 moles

Explanation:

The first step is to find the molar mass of selenium. If you take a look at a periodic table, you will find that there is a little number underneath that says something around 78.96 g/mol. Dividing 99 grams by this number, you get about 1.254 moles of Se. Hope this helps!

7 0
3 years ago
How many moles of NO3 are there in 6.2g?
Nataliya [291]
6.2 divided by the mass number of NO3 is 0.1 moles. Anytime your trying to find the moles of something you divide it by the mass number of your combined elements.
3 0
3 years ago
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What carries the useful energy of a lamp to its surroundings?
serious [3.7K]
A. The potential energy from the batteries in the torch is transferred to the filament of the bulb. The energy is transferred to the surroundings as thermal energy and light. Most of the energy is transferred as thermal energy which is not useful and only some of the energy is transferred as light
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3 years ago
Which of the following are nonelectrolytes? Hc2h302 (acetic acid) CH30H (method alcohol) h2So4 and c12h22011 (sucrose or table s
hoa [83]

Answer:

C₁₂H₂₂O₁₁ and CH₃OH

Explanation:

Sucrose and methyl alcohol are nonelectrolytes. They do not ionize or conduct a current in aqueous solution.

HC₂H₃O₂ is a weak electrolyte. It produces only a few ions and is a poor conductor of electricity in aqueous solution.

HC₂H₃O₂ + H₂O ⇌ H₃O⁺ + C₂H₃O₂⁻

H₂SO₄ is a strong electrolyte. Its first ionization is complete, so it is a good conductor of electricity in aqueous solution.

H₂SO₄ + H₂O ⟶ H₃O⁺ + HSO₄⁻

8 0
3 years ago
What is the molecular formula of the hydrocarbon whose molar mass is 536 g/mol and contains 89.55 w/w% carbon?
leonid [27]

Given the percentage composition of HC as C → 81.82 % and H → 18.18 %

So the ratio of number if atoms of C and H in its molecule can will be:

C : H = 81.82 12 : 18.18 1 C : H = 6.82 : 18.18 = 6.82 6.82 : 18.18 6.82 = 1 : 2.66 ≈ 3 : 8

So the Empirical Formula of hydrocarbon is:

C 3 H 8

As the mass of one litre of hydrocarbon is same as that of C O 2 The molar mass of the HC will be same as that of C O 2 i.e 44 g mol

Now let Molecular formula of the HC be ( C 3 H 8 ) n

Using molar mass of C and H the molar mass of the HC from its molecular formula is:

( 3 × 12 + 8 × 1 ) n = 44 n So 44 n = 44 ⇒ n = 1

Hence the molecular formula of HC is C 3 H 8

Does that help?

7 0
3 years ago
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