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2 years ago

Which of the following combinations led to a precipitation reaction?

Chemistry

1 answer:

Pani-rosa [81]2 years ago

3 0

(3) Silver Nitrate and Aluminium Sulfate

Explanation:

Silver nitrate and aluminium sulphate reacts to form Aluminium nitrate and silver sulfate.

The reaction is shown below:

6AgNO₃ (aq) + Al₂(SO₄)₃ (aq) → 2Al(NO₃)₃ (aq) + 3Ag₂SO₄ (S)

From the balanced equation we can see that Ag₂SO₄ or silver sulfate is the precipitate formed.

Aluminium sulfate and silver nitrate both are chemical compounds. There are many reactions that uses net ionic equation like acid-base neutralization reaction, redox reaction, double displacement reaction etc.

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The decomposition of dinitrogen pentaoxide has an activation energy of 102 kJ/mol and ΔH°rxn = + 55 kJ/mol. What is the activati

ahrayia [7]

Answer: The activation energy of the reverse reaction is 47 kJ/mol

Explanation:

The chemical equation for the decomposition of dinitrogen pentaoxide follows:

$N_2O_5\rightleftharpoons 2NO_2+\frac{1}{2}O_2$

We are given:

Activation energy of the above reaction (forward reaction) = 102 kJ/mol

Enthalpy of the reaction = +55 kJ/mol

As, the enthalpy of the reaction is positive, the reaction is said to be endothermic in nature.

To calculate the activation energy for the reverse reaction, we use the equation:

$E_a_{\text{(forward)}}=E_a_{\text{(backward)}}+|\Delta H|$

where,

$E_a_{\text{(forward)}}$ = Activation energy of the forward reaction = 102 kJ/mol

$E_a_{\text{(backward)}}$ = Activation energy of the backward reaction = ?

$\Delta H$ = Enthalpy of the reaction = +55 kJ/mol

Putting values in above equation, we get:

$102=E_a_{\text{(backward)}}+55\\\\E_a_{\text{(backward)}}=(102-55)=+47kJ/mol$

Hence, the activation energy of the reverse reaction is 47 kJ/mol

3 0

2 years ago

Which of these items best describes the arrangement of electrons in an atom of sulfur? A. Two electrons in its first energy leve

Vesnalui [34]

Two electrons in it's first energy level; eight electrons in it's second energy level; and six valence electrons in it's outermost energy level

8 0

3 years ago

What is the pH of a 4.5x10-6 M solution of HCl.

STALIN [3.7K]

I hope this helps it’s not the exact answer but it can help you

4 0

2 years ago

A compound containing phosphorus and oxygen has a molar mass of 219.9 g/mol and an empirical formula of p2o3. Determine its mole

Softa [21]

Answer:

P₄O₆

Explanation:

The molecular formula is a whole number multiple of the empirical formula. that is, if the mole wt is 219.9 gms/mole and the empirical formula weight is 110 gms/mole*, then the whole number multiple is 219.9/110 = 2 => Molecular formula => (P₂O₄)₂ => P₄O₆.

7 0

3 years ago

Magnesium metal reacts with iodine gas at high temperatures to form magnesium iodide. what mass of mgi2 can be produced from the

sergiy2304 [10]

54.8 g of MgI2 can be produced. To solve this, you need to determine the molar mass of each reactant and the product. First, look up the atomic weights of iodine and magnesium Atomic weight of Iodine = 126.90447 Atomic weight of Magnesium = 24.305 Molar mass of MgI2 = 24.305 + 2 * 126.90447 = 278.11394 Now determine how many moles of Iodine and Magnesium you have moles of Iodine = 50.0 g / 126.90447 g/mol = 0.393997154 mole moles of Magnesium = 5.15 / 24.305 g/mol = 0.211890557 mole Since for every magnesium atom, you need 2 iodine atoms and since the number of moles of available iodine isn't at least 2 times the available moles of magnesium, iodine is the limiting reagent. So figure out how many moles of magnesium will be consumed by the iodine 0.393997154 mole / 2 = 0.196998577 mole. This means that you can make 0.196998577 moles of MgI2. Now simply multiply by the previously calculated molar mass of MgI2 0.196998577 mole * 278.11394 g/mole = 54.78805 g Round the result to the correct number of significant figures. 54.78805 g = 54.8 g

5 0

3 years ago