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Alenkasestr [34]
4 years ago
13

Which of the following best describes how further studies supported Joseph Proust's discovery about proportion of elements in wa

ter?
Max Planck discovered the Planck's constant.
John Dalton proposed that matter is made of tiny particles.
James Chadwick discovered neutral particles in the nucleus of the atom.
Niels Bohr determined that electrons inhabit distinct energy levels.
Chemistry
1 answer:
Softa [21]4 years ago
3 0

Answer is: John Dalton proposed that matter is made of tiny particles.

Proust's law or law of constant composition said that a given chemical compound always contains its component elements in fixed ratio and does not depend on method of preparation.

Water (H₂O) is made of two hydrogen atoms and one oxygen atom:

m(H) : m(O) = 2·1 : 16 = 1: 8.

Dalton said that matter is composed of atoms and atoms of different elements can join to form chemical compound.

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3 years ago
Beryllium oxide, Beo, is an electrical insulator. How
egoroff_w [7]

Answer:

There are 10.0 moles of beryllium oxide in a 250 grams sample of the compound.

Explanation:

We can calculate the number of moles (η) of BeO as follows:

\eta = \frac{m}{M}

Where:

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Hence, the number of moles is:

\eta = \frac{250 g}{25.0116 g/mol} = 10.0 moles

Therefore, there are 10.0 moles of beryllium oxide in a 250 grams sample of the compound.  

I hope it helps you!

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How do we use biomass as an energy source?
kherson [118]
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