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3 years ago

If you designed your own experiment to prove the law of conservation of mass, what conditions would be required?

1 answer:

8 0

1) No. of atoms of all elements participating in the reaction are to be balanced.
2) Pressure Change should be noted (because, if ∆P≈0, it shows the reaction is in equilibrium).
3) The theoretical representation of the reaction should be balanced well.

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Given the reaction 2NaOH + H2SO4 = Na2SO4 + 2H2O, what is the total number of grams of NaOH needed to react completely with 196

ollegr [7]

Answer:

160 g of NaOH

Explanation:

Reaction: 2NaOH + H₂SO₄ = Na₂SO₄ + 2H₂O

When a base and an acid react, the produce water and a salt. → Neutralization

In this reaction 2 moles of hydroxide need 1 mol of sulfuric acid to react, it is the same to say that 1 mol of sulfuric acid needs 2 moles of NaOH to react. We convert the mass of sulfuric to moles and we propose the rule of three:

196 g / 98 g/mol = 2 moles

1 mol of sulfuric acid needs 2 moles of NaOH to react

Then 2 moles of sulfuric acid will react with (2 . 2) /1 = 4 moles of NaOH

We convert the moles of base to grams → 4 mol . 40 g /1mol = 160 g

3 0

3 years ago

Assume you are designing a refrigerator system how would you use gas laws in the designing?

ICE Princess25 [194]

Answer:

Add is wires and lights.

Explanation:

Gas laws include the wire lines the produce temeperature and the lights system.

6 0

3 years ago

How many grams of ice at -13 deg C must be added to 711 grams of water that is initially at a temperature of 87 deg C to produce

Basile [38]

Answer:

The answer to your question is m = 4.7 kg

Explanation:

Data

Ice Water

mass = ? mass = 711 g

T₁ = -13°C T₁ = 87°C

T₂ = 10°C T₂ = 10°C

Ch = 2090 J/kg°K Cw = 4180 J/kg°K

Process

1.- Convert temperature to kelvin

T₁ = 273 + (-13) = 260°K

T₁ water = 87 + 273 = 360 °K

T₂ = 10 + 273 = 283°K

2.- Write the equation of interchange of heat

- Heat lost = Heat absorbed

- mwCw(T₂ - T₁) = miCi(T₂ - T₁)

-Substitution

- 0.711(4180)(10 - 87) = m(2090)(10 - (-13))

- Simplification

228842.46 = 48070m

m = 228842.46/48070

-Result

m = 4.7 kg

4 0

3 years ago

How would you explain why liquids solidify when they are cooled???

Ostrovityanka [42]

When liquids are subjected to lower temperatures, the kinetic energy of the molecules would decrease accordingly making them closer to each other and leading to a decrease in volume until the substance is solidified. Hope this answers the question.

5 0

3 years ago

A girl throws a rock into a pond. A leaf floating on the pond bobs up and down but does not change location on the pond's surfac

sertanlavr [38]

This is due to the difference in density. The rock is denser than the leaf. And also, the rock is denser than the liquid in the pond. If the material is denser than the other material, it will sink. The same holds true for the rock, it sinks. But when the material is less dense than the other material, it floats. And it holds true for the leaf, it floats.

6 0

3 years ago