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Anna007 [38]
2 years ago
12

PLEASE HELP!!! Which of John Dalton's contributions are present in the modern atomic model and which were eventually disproven a

nd thus are not part of the modern model??? If you have any questions please don't ask in the answer box.
Chemistry
1 answer:
Yanka [14]2 years ago
5 0
1) All matter is made of atoms. Atoms are indivisible and indestructible.

2) All atoms of a given element are identical in mass and properties

3) Compounds are formed by a combination of two or more different kinds of atoms.

4) A chemical reaction is a rearrangement of atoms.

1 and 2 were proved wrong.
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Calculate the number of grams of solute in 500.0 mL of 0.189 M KOH.
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Answer : The number of grams of solute in 500.0 mL of 0.189 M KOH is, 5.292 grams

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Volume of solution = 500 ml

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Formula used :

Molarity=\frac{\text{Mass of KOH}\times 1000}{\text{Molar mass of KOH}\times \text{Volume of solution in ml}}

Now put all the given values in this formula, we get the mass of solute KOH.

0.189M=\frac{\text{Mass of KOH}\times 1000}{(56g/mole)\times (500ml)}

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