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nika2105 [10]
3 years ago
11

Please help me with this question it’s due in five minutes I’ll give brainliest

Chemistry
1 answer:
zysi [14]3 years ago
5 0
I believe the correct answer is A) 6
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Butane, C4H10 has a standard enthalpy of combustion= -2881 kJ/mol
Bad White [126]

Answer:

14.91 K.

Explanation:

  • To solve this problem, we can use the following relation:

<em>Q = m.c.ΔT,</em>

where, Q is the amount of heat transferred to water.

m is the mass of the amount of water (m = 2.0 kg = 2000.0 g).

c is the specific heat capacity of water (c = 4.2 J/g.K).

ΔT is the change in temperature due to the transfer of butane burning.

  • To determine Q that to be used in calculation:

Q from 4.000 g of butane is completely burned is - 198.3 kJ = 198300 J.

<em>The negative sign</em><em> symbolizes the the enthalpy change is </em><em>exothermic</em><em>, which means that </em><em>the</em><em> </em><em>energy is released</em><em>. </em>

  • Note that only 63.15% of the energy generated is actually transferred to the water.

∴ Q (the amount of heat transferred to water) = (198300 J)(0.6315) = 125226.45 J.

  • Now, we can obtain the change in temperature:

∴ ΔT = Q/m.c. = (125226.45 J) / (2000.0 g)(4.2 J/g.K) = 14.9079 K ≅ 14.91 K.

<em>This means that the temperature is increased by 14.91 K.</em>

<em />

5 0
3 years ago
3 points
Sauron [17]

Hey there!

Elements and compounds are purely homogeneous substances and they have a constant composition throughout. Elements and compounds cannot be separated into their respective constituents by physical means. Compounds and mixtures are made up of different elements or different atoms.

7 0
3 years ago
Write the chemical equation for phosporic acid, h3po4, is produced through a chemical reaction between tetraphosporus decoxide a
ohaa [14]
P_{4}O_{10} + 6H_{2}O ---\ \textgreater \  4H_{3}PO_{4}
6 0
3 years ago
Carlos is making phosphorus trichloride using the equation below. He uses 15.5 g of phosphorus and collects 50.9 g of phosphorus
Oxana [17]

Answer : The mass of chlorine reacted with the phosphorus is, 53.25 grams.

Explanation :

First we have to calculate the moles of phosphorus.

\text{Moles of phosphorus}=\frac{\text{Mass of phosphorus}}{\text{Molar mass of phosphorus}}

\text{Moles of phosphorus}=\frac{15.5g}{31g/mol}=0.5mol

Now we have to calculate the moles of Cl_2

The balanced chemical reaction is:

2P+3Cl_2\rightarrow 2PCl_3

From the balanced chemical reaction, we conclude that

As, 2 moles of phosphorous react with 3 moles of Cl_2

So, 0.5 moles of phosphorous react with \frac{3}{2}\times 0.5=0.75 moles of Cl_2

Now we have to calculate the mass of Cl_2

\text{Mass of }Cl_2=\text{Moles of }Cl_2\times \text{Molar mass of }Cl_2

Molar mass of Cl_2 = 71 g/mol

\text{Mass of }Cl_2=0.75mol\times 71g/mol=53.25g

Therefore, the mass of chlorine reacted with the phosphorus is, 53.25 grams.

4 0
4 years ago
Read 2 more answers
Used to pick up or hold hot objects
Deffense [45]

In Chemistry class, tongs are used to pick up or hold hot objects.

4 0
3 years ago
Read 2 more answers
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