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malfutka [58]
2 years ago
8

Using the following equation

Chemistry
2 answers:
Valentin [98]2 years ago
7 0
Thermal energy when solid, liquor , and gas combine
Reil [10]2 years ago
6 0

Answer : The mass of H_2O produced will be, 17 grams.

Explanation : Given,

Mass of C_2H_6 = 9.5 g

Mass of O_2 = 130 g

Molar mass of C_2H_6 = 30 g/mole

Molar mass of O_2 = 32 g/mole

Molar mass of H_2O = 18 g/mole

First we have to calculate the moles of C_2H_6 and O_2.

\text{Moles of }C_2H_6=\frac{\text{Mass of }C_2H_6}{\text{Molar mass of }C_2H_6}=\frac{9.5g}{30g/mole}=0.317moles

\text{Moles of }O_2=\frac{\text{Mass of }O_2}{\text{Molar mass of }O_2}=\frac{130g}{32g/mole}=4.06moles

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O

From the balanced reaction we conclude that

As, 2 moles of C_2H_6 react with 7 mole of O_2

So, 0.317 moles of C_2H_6 react with \frac{7}{2}\times 0.317=1.109 moles of O_2

From this we conclude that, O_2 is an excess reagent because the given moles are greater than the required moles and C_2H_6 is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of H_2O.

As, 2 moles of C_2H_6 react to give 6 moles of H_2O

So, 0.317 moles of C_2H_6 react to give \frac{6}{2}\times 0.317=0.951 moles of H_2O

Now we have to calculate the mass of H_2O.

\text{Mass of }H_2O=\text{Moles of }H_2O\times \text{Molar mass of }H_2O

\text{Mass of }H_2O=(0.951mole)\times (18g/mole)=17.118g\approx 17g

Therefore, the mass of H_2O produced will be, 17 grams.

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Calculate the standard cell potential at 25 ∘c for the reaction x(s)+2y+(aq)→x2+(aq)+2y(s) where δh∘ = -793 kj and δs∘ = -319 j/
QveST [7]
First we will calculate free energy change:
ΔG₀ = ΔH₀ - (T * ΔS₀)
        = - 793 kJ - (298 * - 0.319 kJ/K) = - 698 kJ
We know the relation between free energy change and cell potential is:
ΔG₀ = - n F E⁰ where
F = Faraday's constant = 96485 C/mol
n = 2 (given by equation that the electrons involved is 2)
ΔG₀ = - 2 x 96485 x E⁰
- 698 kJ = - 2 x 96485 x E⁰
E⁰ = (698 x 1000) / (2 x 96485) = 3.62 volts   
 
5 0
3 years ago
a compound has an empirical formula of CH2 what is the molecular formula if it's molar mass is 252.5 grams/mol
Goryan [66]

Empirical formula is the simplest ratio of components making up the compound. the molecular formula is the actual ratio of components making up the compound.

the empirical formula is CH₂. We can find the mass of CH₂ one empirical unit and have to then find the number of empirical units in the molecular formula.

Mass of one empirical unit - CH₂ - 12 g/mol x 1 + 1 g/mol x 2 = 12 = 14 g

Molar mass of the compound is - 252 .5 g/mol

number of empirical units = molar mass / mass of empirical unit

                                           = \frac{252.5 g/mol}{14 g}

                                           = 18 units

Therefore molecular formula is - 18 times the empirical formula

molecular formula  - CH₂ x 18 = C₁₈H₃₆                                            

molecular formula is C₁₈H₃₆  

8 0
3 years ago
A sample of 211 g of iron (III) bromide is reacted with
Alisiya [41]

FeBr₃ ⇒ limiting reactant

mol NaBr = 1.428

<h3>Further explanation</h3>

Reaction

2FeBr₃ + 3Na₂S → Fe₂S₃ + 6NaBr

Limiting reactant⇒ smaller ratio (mol divide by coefficient reaction)

  • FeBr₃

211 g of Iron (III) bromide(MW=295,56 g/mol), so mol FeBr₃ :

\tt n=\dfrac{mass}{MW}\\\\n=\dfrac{211}{295,56}\\\\n=0.714

  • Na₂S

186 g of Sodium sulfide(MW=78,0452 g/mol), so mol Na₂S :

\tt n=\dfrac{186}{78.0452}=2.38

Coefficient ratio from the equation FeBr₃ :  Na₂S = 2 : 3, so mol ratio :

\tt FeBr_3\div Na_2S=\dfrac{0.714}{2}\div \dfrac{2.38}{3}=0.357\div 0.793

So  FeBr₃ as a limiting reactant(smaller ratio)

mol NaBr based on limiting reactant (FeBr₃) :

\tt \dfrac{6}{3}\times 0.714=1.428

6 0
3 years ago
At ground level, how are rain and hail similar?
Varvara68 [4.7K]

Answer:

rain is water in molten state

hails are water in solid form.

hope it helps

Plz mark me as brainleist if helps

Have a great day ahead

3 0
2 years ago
Read 2 more answers
Is anybody good in Chemistry that can help me with this?​
sesenic [268]

Answer:

just replace the 9 mole with 3.68 g of Al .

I think it will help you.

5 0
2 years ago
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