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3 years ago

Based on the molar masses, how can you tell that an equation is balanced?

2 answers:

7 0

When you work with molar mass, you solve for the quantity of ''Moles'' within the substance by converting Mass. The way you can tell the equation is balanced would be by knowing whether the moles were equivalent on both sides or not. Therefore, if they are equal, it is balanced considering you have the same amount of moles on each side of the equation.

Rashid [163]3 years ago

5 0

Explanation :

According to the law of conservation of mass, the mass of reactant must be equal to the mass of product. That means mass remains conserved.

Based on the molar masses, we can tell that an equation is balanced or not.

If the sum of the molar mass of reactant side will be equal to the sum of the molar mass of product side then we can tell that an equation is balanced otherwise an equation is not balanced.

For example : $2Na+2H_2O\rightarrow 2NaOH+H_2$

Now we have to check that this reaction is balanced or not.

As per law of conservation of mass,

Sum of molar mass of reactant = Sum of molar mass of product

$2Na+2H_2O=2NaOH+H_2$

The molar mass of sodium(Na), hydrogen(H) and oxygen(O) are 23, 1 and 16 g/mole respectively.

$2(23)+2(2\times 1+16)=2(23+16+1)+2(1)$

$82=82$

The mass of reactant side is equal to the product side that means this equation is balanced.

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Which statement is a valid conclusion about the activation energy of the reverse reaction if the forward reaction is exothermic?

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Answer:

e) The activation energy of the reverse reaction is greater than that of the forward reaction.

Explanation:

Activation energy is the minimum amount of energy that is required by the reactants to start a reaction.
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3 years ago

A scientist experiments ima unknown solution. She notices that when a base, sodium hydroxide, is added to the solution, it forms

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The unknown solution is acidic

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2 years ago

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A full bottle of water was left outside overnight in freezing temperatures, causing the bottle to crack. No mass was added or re

kodGreya [7K]

Answer:The correct answer is option C.

Explanation;

Water has unique property that is, it expands on freezing.Which is the reason for less density of ice than water. The cracking of the bottle was due to the expansion of water (present inside the bottle) on freezing.

Generally, density is inversely proportional to the volume of the substance.

$Density=\frac{Mass}{Volume}$

$Density\propto \frac{1}{Volume}$

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3 years ago

1. When you first opened the bottle of coke the pressure of gas in the coke (increased/decreased) and the dissolved gas( stays i

Serga [27]

Answer:

1. When you first opened the bottle of coke the pressure of gas in the coke (increased) and the dissolved gas(leaves) the coke. 2. When you placed the coke in hot water , the pressure of gas in the coke (increased) and the dissolved gas(leaves) the coke 3. Therefore to increase the solubility of a gas in a liquid ( that is to make a gas more soluble in a liquid.

Explanation:

Hope it helps.

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2 years ago

Ni2+(aq) + 6 NH3(aq) ⇌ Ni(NH3)6 2+(aq)

Jet001 [13]

Answer:

a) ΔGº= -49,9 KJ/mol = - 50 KJ/mol

b) The reaction goes to the right to formation of products

c) ΔG= 84,42 KJ/mol. The direction is to reactive, to the left

Explanation:

a) ΔGº= - RTLnKf

You need to convert Cº to K. 25ºC=298K

Then, ΔGº= - 3,814 J/molK * 298K* Ln(5.6 *10^8)= - 49906 J/mol = -49,9 KJ/mol = - 50 KJ/mol

b) The ΔGº < 0, that means the direct reaction is spontaneous when te reactive and products are in standard state. In other words the reaction goes to the right, to formation of products

c) The general ecuation for chemical reaction is aA + bB → cD + dD. Thus

ΔG=ΔGº + RTLn (([C]^c*[D]^d)/[A]^a*[B]^b)

In this case,

ΔG=ΔGº + RTLn ([Ni(NH3)62+] / [Ni2+]*[NH3]^6 )= 84417 J/mol =84,42 KJ/mol

ΔG >0 means the reaction isn't spontaneous in the direction of the products. Therefore the direction is to reactive, to the left

8 0

2 years ago