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2 years ago

Please help, timed test, will give brainliest

Chemistry

1 answer:

OlgaM077 [116]2 years ago

4 0

Answer:

The answer to your question is letter B

Explanation:

A.) 2 AgCl + Na2S ⟶ 2 Ag2S + 2 NaCl

Reactants Elements Products

2 Ag 4

2 Cl 2

2 Na 2

1 S 2

This reaction is unbalanced

B.) 2 AgCl + Na2S ⟶ Ag2S + 2 NaCl

Reactants Elements Products

2 Ag 2

2 Cl 2

2 Na 2

1 S 1

This reaction is balanced

C.) AgCl + Na2S ⟶ 2 Ag2S + 2 NaCl

Reactants Elements Products

1 Ag 4

1 Cl 2

2 Na 2

1 S 2

This reaction is unbalanced

D.) 2 AgCl + 2 Na2S ⟶ Ag2S + NaCl

Reactants Elements Products

2 Ag 4

2 Cl 1

4 Na 1

2 S 1

This reaction is unbalanced

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You are balancing an ionic compound. Let's call it: AB.

rewona [7]

Answer:- $A_3B_2$

Explanations:- It is given that the charge for A is +2 and the charge for B is -3. The over all compound is neutral means the over all charge is zero. For making the over all charge zero, we need 3 positive ions and 2 negative ions. This makes a +6 charge for A and -6 charge for B and the over all charge is zero.

Also, if we think about the criss cross then charge of A becomes the subscript of B and the charge of B becomes the subscript of A.

So, the formula of the ionic compound is $A_3B_2$ . In this compound the ratio of A to B is 3:2.

The balanced equation could be shown as:

$3A+2B\rightarrow A_3B_2$

8 0

2 years ago

What characteristics of polyethylene glycol (PEG) make it an excellent substance for the liquid inside the paintballs?

Blizzard [7]

Huhuhghb 66 hope this helps!

3 0

2 years ago

For the decomposition of calcium carbonate, consider the following thermodynamic data (Due to variations in thermodynamic values

In-s [12.5K]

Answer : The temperature in kelvins is, $T>1108.695K$

Explanation : Given,

$\Delta H$ = 178.5 KJ/mole = 178500 J/mole

$\Delta S$ = 161.0 J/mole.K

Gibbs–Helmholtz equation is :

$\Delta G=\Delta H-T\Delta S$

As per question the reaction is spontaneous that means the value of $\Delta G$ is negative or we can say that the value of $\Delta G$ is less than zero.

$\Delta$

The above expression will be:

$0>\Delta H-T\Delta S$

$T\Delta S>\Delta H$

$T>\frac{\Delta H}{\Delta S}$

Now put all the given values in this expression, we get :

$T>\frac{178500J/mole}{161.0J/mole.K}$

$T>1108.695K$

Therefore, the temperature in kelvins is, $T>1108.695K$

7 0

2 years ago

Calculate the number of moles in 7.41 X 1017 atoms Ag.

jolli1 [7]

Answer:

1.23x10^-6 mole

Explanation:

A clear understanding of Avogadro's hypothesis proved that 1mole of any substance contains 6.02x10^23 atoms. This indicates that 1mole of Ag contains 6.02x10^23 atoms.

Now, 1f 1mole of Ag contains 6.02x10^23 atoms, then Xmol of Ag will contain 7.41x10^17 atoms i.e

Xmol of Ag = 7.41x10^17/6.02x10^23 = 1.23x10^-6 mole

4 0

2 years ago

please hurry! If 3.87g of powdered aluminum oxide is placed in a container containing 5.67g of water, what is the limiting react

VikaD [51]

Answer:

Explanation:

Given parameters:

Mass of aluminium oxide = 3.87g

Mass of water = 5.67g

Unknown:

Limiting reactant = ?

Solution:

The limiting reactant is the reactant in short supply in a chemical reaction. We need to first write the chemical equation and convert the masses given to the number of moles.

Using the number of moles, we can ascertain the limiting reactants;

Al₂O₃ + 3H₂O → 2Al(OH)₃

Number of moles;

Number of moles = $\frac{mass}{molar mass}$

molar mass of Al₂O₃ = (2x27) + 3(16) = 102g/mole

number of moles = $\frac{3.87}{102}$ = 0.04mole

molar mass of H₂O = 2(1) + 16 = 18g/mole

number of moles = $\frac{5.67}{18}$ = 0.32mole

From the reaction equation;

1 mole of Al₂O₃ reacted with 3 moles of H₂O

0.04 mole of Al₂O₃ will react with 3 x 0.04 mole = 0.12 mole of H₂O

But we were given 0.32 mole of H₂O and this is in excess of amount required.

This shows that Al₂O₃ is the limiting reactant

6 0

2 years ago