(this is science not chemistry)

Which of the following equations does not demonstrate the law of conservation of mass?

enot [183]

The third option does not obey the law of conservation of mass.

Option 3.

Explanation:

The law of conservation of mass states that the sum of the masses of reactants should be equal to the sum of the masses of the products.

For example, if we consider the first option to verify if it obeys law of conservation of mass or not, 2 Na + Cl₂ → 2 NaCl

So one way to verify it is to find the mass of Na, then multiply it with 2, and then add this with 2 times of mass of chlorine. So this sum should be equal to the 2 times mass of NaCl. But it is somewhat lengthy.

Another way to easily determine this is to check if the elements are present equally in both sides. Such as, in reactant side and product side 2 atoms of Na is present . Similarly, the Cl atoms are also present in equal number in both reactant and product side. Thus this obeyed the law of conservation of mass.

Like this, if we see the second option, there also 1 atom of Na is present in reactant and product side and 2 molecules of H is present in reactant and product side, 1 oxygen is present in reactant and product side and 1 Cl is present in reactant and product side. So it also obeys the law of conservation of mass.

But in the third option, P₄ + 5 O₂→ 2 P₄O₁₀, here, there is 4 atoms of P in reactant side but in product side there is (4*2) = 8 atoms of P. Similarly, the number of atoms of oxygen in reactants and product side is also not same. So the third option does not obey the law of conservation of mass.

The fourth option also obeys the law of conservation of mass as the number of atoms of each element is same in both the product and reactant side.

Thus, the third option does not obey the law of conservation of mass.

5 0

4 years ago

What is the oxidation state of each element in S03^2-?

ankoles [38]

Mycraf I fink? Sory is wrong

5 0

3 years ago

Ammonium phosphate ((NH4)3PO4) is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid (H3PO4

Alex Ar [27]

Taking into account the reaction stoichiometry, 8.8488 grams of (NH₄)₃PO₄ is produced by the reaction of 5.82g of phosphoric acid.

<h3>Reaction stoichiometry</h3>

In first place, the balanced reaction is:

H₃PO₄ + 3 NH₃ → (NH₄)₃PO₄

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

H₃PO₄: 1 mole
NH₃: 3 moles
(NH₄)₃PO₄: 1 mole

The molar mass of the compounds is:

H₃PO₄: 98 g/mole
NH₃: 17 g/mole
(NH₄)₃PO₄: 149 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

H₃PO₄: 1 mole ×98 g/mole= 98 grams
NH₃: 3 moles ×17 g/mole= 51 grams
(NH₄)₃PO₄: 1 mole ×149 g/mole= 149 grams

<h3>Mass of ammonium phosphate formed</h3>

The following rule of three can be applied: if by reaction stoichiometry 98 grams of H₃PO₄ form 149 grams of (NH₄)₃PO₄, 5.82 grams of H₃PO₄ form how much mass of (NH₄)₃PO₄?

mass of (NH₄)₃PO₄= $\frac{5.82 grams of H_{3} PO_{4}x149 grams of (NH_{4} )_{3}PO_{4} }{98 grams of H_{3} PO_{4}}$

<u><em>mass of (NH₄)₃PO₄= 8.8488 grams</em></u>

Finally, 8.8488 grams of (NH₄)₃PO₄ is produced by the reaction of 5.82g of phosphoric acid.

Learn more about the reaction stoichiometry:

brainly.com/question/24741074

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#SPJ1

3 0

1 year ago

Above the critical pressure, a substance is a(n) _____ fluid.

olga2289 [7]

The correct answer among the choices given is option C. Above the critical pressure, a substance is a supercritical fluid. This fluid is any substance at a temperature and pressure above the critical point here the phases of the liquid and the gas do not exist.

8 0

3 years ago

Read 2 more answers

A certain chemical reaction releases 13.1 kj/g of heat for each gram of reactant consumed. How can you calculate what mass of re

IRINA_888 [86]

Yo sup??

Heat produced per gram of reactant=13.1 KJ

.=13100 J

Actual heart produced=1850 J

By applying unitary method we get the weight of reactant to be x

x=1850/13100

=0.141 gm

Hope this helps

8 0

3 years ago