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butalik [34]
2 years ago
8

The reaction for the combustion of methane is shown below. If 28.70g of methane

Chemistry
1 answer:
antiseptic1488 [7]2 years ago
8 0
Omg hard question but it’s also amazing imma think about that question
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A 100.0 mL sample of 0.300 M NaOH is mixed with a 100.0 mL sample of 0.300 M HNO3 in a coffee cup calorimeter. If both solutions
Mars2501 [29]

Answer:

Qm  = -55.8Kj/mole

Explanation:

NaOH(aq) + HNO₃(aq) => NaNO₃(aq) + H₂O(l)

Qm = (mc∆T)water /moles acid

Given => 100ml(0.300M) NaOH(aq) + 100ml(0.300M)HNO₃(aq)

=> 0.03mole NaOH(aq) + 0.03mole HNO₃(aq)

=> 0.03mole NaNO₃(aq) + 0.03mole H₂O(l)

ΔH⁰rxn = [(200ml)(1.00cal/g∙°C)(37 – 35)°C]water / 0.03mole HNO₃

= 13,333 cal/mole x 4.184J/cal = 55,787J/mol = 55.8Kj/mole (exothermic)*

Heat of reactions comes from formation of H-Oxy bonds on formation of water of reaction and heats the 200ml of solvent water from 35⁰C to 37⁰C.

4 0
3 years ago
Read 2 more answers
Is it called when a substance enters a gaseous phase without boiling?
Helen [10]

Answer:

its called sublimation

3 0
3 years ago
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What is the purpose of a drying agent in the work up of an organic reaction?
vladimir1956 [14]

Answer:To absorb small amounts of water in an organic solution.

Explanation:A drying agent is added to absorb small amounts of water, usually from an organic solution after its separation from an aqueous solution.

3 0
2 years ago
is this information about magnesium true symbol..mg number..12 atomic mass..24.305 number of protons 12.... PLZ HELP :)
maxonik [38]
Yes, that is all correct! 

The atomic number is the same as the number of protons (12).
Magnesium = Mg
Atomic mass is 24. 305.
3 0
2 years ago
An objects mechanical energy is the sum of its?
frosja888 [35]
Mechanical energy<span> of </span>an object<span> can be the result of </span>its<span> motion 
i think

</span>
3 0
3 years ago
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