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2 years ago

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State the postulates of Dalton's atomic theory.

2 answers:

horrorfan [7]2 years ago

4 0

A theory of chemical combination, first stated by John Dalton in 1803. It involves the following postulates: (1) Elements consist of indivisible small particles (atoms). (2) All atoms of the same element are identical; different elements have different types of atom. (3) Atoms can neither be created nor destroyed.

(Brainliest me)

Lelechka [254]2 years ago

3 0

Answer:

<h3><u>The </u><u>Postulates of Dalton's Atomic Theor</u>y<u>:</u></h3>

All matter is made of very tiny particles called atoms.
Atoms are indivisible particles which cannot be created or destroyed in a chemical reaction.
Atoms of given element are identical in mass and chemical properties.
Atoms of different elements have different masses and chemical properties.
Atom combine in the ratio of small whole numbers to form compounds.
The relative number and kinds of atoms are constant in a given compound.

<u>-TheUnknownScientist 72</u>

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<u>Answer:</u> The correct answer is Option D.

<u>Explanation:</u>

To calculate the moles of a solute, we use the equation:

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We are given:

Volume of sulfuric acid = 450mL = 0.45 L (Conversion factor: 1 L = 1000 mL)

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Putting values in above equation, we get:

$0.5mol/L=\frac{\text{Moles of sulfuric acid}}{0.45L}\\\\\text{Moles of sulfuric acid}=0.225mol$

For the given chemical reaction:

$H_2SO_4(aq.)+2NaHCO_3(aq.)\rightarrow Na_2SO_4(aq.)+2H_2O(l)+2CO_2(g)$

By Stoichiometry of the reaction:

1 mole of sulfuric acid reacts with 2 moles of sodium bicarbonate.

So, 0.225 moles of sulfuric acid will react with = $\frac{2}{1}\times 0.225=0.45mol$ of sodium bicarbonate

To calculate the mass of sodium bicarbonate, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Moles of sodium bicarbonate = 0.45 moles

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