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2 years ago

Which of the following shows a valid combustion reaction?

Chemistry

2 answers:

marta [7]2 years ago

3 0

Answer: C2H4 + 3O2 → 2CO2 + 2H2O

Explanation:

2Al + 2O2 → 2AlO + O2 Not Balanced Properly: 2Al + O2 = 2AlO

C2H4 + 3O2 → 2CO2 + 2H2O Looks Good

2CH4 + O2 → 2CO + 4H2 Not Correct: CO should be CO2

Ca + O2 → CaOH Not Balanced and No source for the H

Yakvenalex [24]2 years ago

3 0

Answer:

2H4+3O2 →2CO2+2H2

Explanation:

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Identify each definition that applies to the compound in red. Check all that apply.

andre [41]

Answer:

Arrhenius acid & Bronsted-Lowry acid

Explanation:

4 0

3 years ago

What is the percent by volume of isopropyl alcohol in a solution that contains 45 ml of isopropyl alcohol in 1.4 L of water?

11Alexandr11 [23.1K]

Answer:

3.11%

Explanation:

We express a solution's volume by volume percent concentration, % v/v,

Take the ratio of the isopropyl alcohol (IPA) volume to the total volume of the solution, which is 1400 mL of water+ 45 mL of IPA,

and multiply by 100 to get the percentage: 45/(1400+45) *100 = 0.0311*100 = 3.11%

6 0

3 years ago

In the presence of CN-, Fe3 forms the complex ion Fe(CN)63-. The equilibrium concentrations of Fe3 and Fe(CN)63- are 8.5 x 10-40

aleksklad [387]

Answer:

Kf = 9.96x10⁴¹

Explanation:

When Fe³⁺ and CN⁻ are in water, complex Fe(CN)₆³⁻ is formed, thus:

Fe³⁺ + 6CN⁻ ⇄ Fe(CN)₆³⁻

Kf is defined as:

Kf = [Fe(CN)₆³⁻] / [Fe³⁺] [CN⁻]⁶

Equilibrium concentration of ions is:

[Fe(CN)₆³⁻] = 1.5x10⁻³M

[Fe³⁺] = 8.5x10⁻⁴⁰

[CN⁻] = [KCN] = 0.11M

Replacing in Kf expression:

Kf = [1.5x10⁻³M] / [8.5x10⁻⁴⁰] [ 0.11M]⁶

5 0

3 years ago

Both compounds A and B have molecular formula C6H14. Monochlorination of compound A results in the formation of two constitution

Katarina [22]

Answer:

The name of the two compounds will be:

A :2,2-dimethylbutane

B: 3-methylpentane

Explanation:

The compounds are the isomers of hexane as per the given molecular formula.

There is no unsaturation or no ring is present in the compound.

Constitutional isomers are the one which have different arrangement of chain.

The possible compounds are shown in the figure with the products of monochlorination of the two isomers.

Thus there are five possible isomers of hexane.

3 0

3 years ago

When 40.0 mL of 0.200 M HCl at 21.5°C is added to 40.0 mL of 0.200 M NaOH also at 21.5°C in a coffee-cup calorimeter, the temper

MakcuM [25]

Answer:

The enthalpy change for the reaction is ΔH = - 54.3 kJ/mol

Explanation:

The reaction between HCl and NaOH is a neutralization reaction:

$HCl + NaOH \rightarrow NaCl + H2O$

Heat released during neutralization = Heat gained by water

i.e. $\qrxn = -\q(solution)-----(1)$

where:

$\q(solution) = mc\Delta T-----(2)$

m = total mass of solution

$m = density*total\ volume = 1.00g/ml*(40.00+40.00)ml = 80.00\ g$

ΔT = change in temperature = 22.8 - 21.5 = 1.3 C

c = specific heat = 4.18 J/g C

$\q(solution) = 80.00g*4.18J/gC*1.3C = 434.7 J$

As per equation (1): qrxn = -434.7 J

The reaction enthalpy ΔH is the heat released per mole of acid (or base)

$Moles\ of\ HCl = V(HCl) * M(HCl) = 0.040 L*0.200moles/L = 0.008\ moles$

$\Delta Hrxn = \frac{q}{mole}=\frac{-434.7J}{0.008mole}=-54337 J/mol=-54.3 kJ/mol$

7 0

3 years ago