All categories

3 years ago

Question is above pls helpA)2B)3C)4D)5

Chemistry

1 answer:

zvonat [6]3 years ago

7 0

Answer:

5 will come in blank

4KMnO₄ ----------> 2K₂O + 4MnO + 5O₂

Explanation:

Reaction:

4KMnO₄ ----------> 2K₂O + 4MnO + ____O₂

this reaction is the dissociation reaction in which KMnO₄ is break down into its component.

KMnO₄ upon dissociation gives Potassium oxide, manganese oxide and liberate oxygen

Balance Chemical Equation:

A balanced chemical equation is that in which the the number of the reactant atoms equal to the number of the product atom.

For example if the oxygen at the reactant side is 4, the number of oxygen should be 4 on the product side.

So for this purpose we have to balnce the reaction and number of atoms on each side of the arrow

if we see the given Equation

Numbers of atom on reactant Side:

K = 4

Mn = 4

O = 16

Numbers of atom on reactant Side:

K = 4

Mn = 4

O = 6 instead of blank oxygen molecule

so from the above data we have 10 oxygen less.

If we put the 5 in the blank then we will have 10 oxygen and equation will be balanced

So the balanced Equation will be

4KMnO₄ ----------> 2K₂O + 4MnO + 5O₂

You might be interested in

In a science lab, Cash mixes two clear liquids together in a beaker. Bubbles are produced, and a white solid forms and settles t

Greeley [361]

Answer:

A chemical change occurred, a gas and precipitate was produced

Explanation:

From the question , we are informed of science lab, where Cash mixes two clear liquids together in a beaker. Bubbles are produced, and a white solid forms and settles to the bottom.

In this case the change that took place is chemical change ( is one where new product are formed after two substance react) the bubbles that is produced signify the presence of gas in the product, white solid formed is reffered to as a precipitate( which is reffered to as solid that is been formed from a particular solution).

5 0

3 years ago

How many mL of a 0.250M sodium hydroxide solution is needed to neutralize 25.0 mL of a 0.430M sulfuric acid solution?

kotykmax [81]

Answer:

86.0 mL

Explanation:

i just did the USA test prep

5 0

3 years ago

which equation is set up correctly to determine the volume of a 1.5 mole sample of oxygen gas at 22 C and 100kPa

Murljashka [212]

Under STP condition, the gas has a rule of 22.4 L per mole. And according to the ideal gas law, V1/T1=V2/T2. Under STP, 1.5 mol gas has volume of 33.6 L. So the volume under 22 C is 33.6*295/273=36.3 L.

7 0

4 years ago

In a coffee-cup calorimeter, 150.0 mL of 0.50 M HCl is added to 50.0 mL of 1.00 M NaOH to make 200.0 g solution at an initial te

Zigmanuir [339]

Answer:

51.54°C the final temperature of the calorimeter contents.

Explanation:

$HCl+NaOH\rightarrow H_2O+NaCl,\Delta H=-56 kJ/mol$

$moles=Molarity\times Volume (L)$

Molarity of HCl= 0.50 M

Volume of HCl= 150.0 mL = 0.150 L

Moles of HCl= n

$n=0.50 M\times 0.150 L=0.075 mol$

Molarity of NaOH= 1.00 M

Volume of NaOH= 50.0 mL = 0.050 L

Moles of NaOH= n'

$n'=1.00 M\times 0.050 L=0.050 mol$

Since moles of NaOH are less than than moles of HCl. so energy release will be for neutralization of 0.050 moles of naOH by 0.050 moles of HCl.

n = 0.050

$-56 kJ/mol=-\frac{Q}{n}$

$Q=56 kJ/mol\times 0.050 kJ/mol=2.8 kJ=2800 J$

(1 kJ= 1000 J)

The energy change released during the reaction = 2800 J

Volume of solution = 150.0 mL + 50.0 mL = 200.0 mL

Density of the solution (water) = 1.00g/mL

Mass of the solution , m= 200 mL × 1.00 g/mL = 200 g

Now , calculate the final temperature by the solution from :

$q=mc\times (T_{final}-T_{initial})$

where,

q = heat gained = 2800 J

c = specific heat of solution = $4.184 J/^oC$

$T_{final}$ = final temperature = $?$

$T_{initial}$ = initial temperature = $48.2^oC$

Now put all the given values in the above formula, we get:

$2800 J=200.0 g\times 4.184 J/^oC\times (T_{final}-48.2)^oC$

$T_{final}= 51.54^oC$

51.54°C the final temperature of the calorimeter contents.

7 0

3 years ago

If the following reaction is carried out what amount of C2H6 will be needed to form 50.0 g of CO2

valina [46]

Answer:

The specific heat ($c_s$) of a substance is the amount of energy needed to raise the temperature of 1 g of the substance by 1°C, and the molar heat capacity ($c_p$) is the amount of energy needed to raise the temperature of 1 mol of a substance by 1°C. Liquid water has one of the highest specific heats known.

Explanation:

3 0

3 years ago

Question is above pls helpA)2B)3C)4D)5​

Question is above pls helpA)2B)3C)4D)5