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3 years ago

How to determine the moles of a compound using volume?

1 answer:

3 0

I assume you mean, how to calculate the moles in a substance from grams.

Firstly, you will need to take into account the mass number of the atoms in the molecular compound.

Say, H2O.
Hydrogen mass = 1.00794
Oxygen mass = 15.9994

I will then have to multiply the atoms by their quantities and combine the molecular compound atoms' mass, respectively.

(2)(1.00794) + (1)(15.9994) = 18.01528.

This is used as the divisor that is divided to grams, to find the moles of a substance.

For example, 10 grams is 10/18.01528 = 0.56 moles

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Write the chemical equations involved in this experiment and how that the rate of disappearance of [S2O8^2-] is proportional to

Ne4ueva [31]

S₂O₈²⁻

(aq) + 2I⁻

(aq) → I₂(aq) + 2SO₄

²⁻(aq)

2S₂O₃²⁻

(aq) + I₂(aq) → S₄O₆²⁻

(aq) + 2I⁻

(aq)

Explanation:

S₂O₈²⁻

(aq) + 2I⁻

(aq) → I₂(aq) + 2SO₄

²⁻(aq)

To measure the rate of this reaction we must measure the rate of concentration change of one of the reactants or products. To do this, we will include (to the reacting S₂O₈

²⁻ and I⁻

i) a small amount of sodium thiosulfate, Na₂S₂O₃,

ii) some starch indicator.

The added Na₂S₂O₃ does not interfere with the rate of above reaction, but it does consume the I₂ as soon as it is formed.

2S₂O₃²⁻

(aq) + I₂(aq) → S₄O₆²⁻

(aq) + 2I⁻

(aq)

This reaction is much faster than the previous, so the conversion of I2 back to I⁻ is essentially instantaneous.

$rate = \frac{dI2}{dt} = \frac{1/2 [S2O3^2^-]}{t}$

5 0

3 years ago

Periodic Trends PLEASE HELP ME! I WILL GIVE BRAINLIEST

xz_007 [3.2K]

Answers:

A) Li

B) Ar

C) Br

D) Ne

E) B

5 0

4 years ago

2) write down two examples of mixtures and state their use in daily life.

prisoha [69]

Answer:

first example is. Air it is mixture of many 

gases 

it's us it keeps us alive and many more uses

second example is water is also a mixture 

made up of carbon and hydrogen 

and its uses is to fulfill our needs 

hope it helps

7 0

3 years ago

The starting substanceses of a chemical reaction are refered to as

Debora [2.8K]

The starting substances in a chemical reaction are called reactants - they are written on the left side of a chemical equation.

6 0

4 years ago

Consider the half reaction below.

Rufina [12.5K]

Answer:

Reduction reaction

This is so because considering the reaction Cu 2+ has been reduced to Cu(s) by losing two electrons , and any other element that undergoes this stage is termed as a reduction reaction.

Hope this helps

6 0

3 years ago