21: potassium has 20 neutrons
22: is d
95.611 g/mol that's the answers
Answer:
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Answer:
Explanation:
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In this case, given the T-V variation, we understand it is possible to apply the Charles' law as shown below:
Thus, since we are interested in the initial temperature, we can solve for T1, plug in the volumes and use T2 in kelvins:
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Answer:
Explanation:
Dalton’s Atomic Theory
The main points of Dalton’s atomic theory are:
=Everything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed.
=All atoms of an element are identical.
=The atoms of different elements vary in size and mass.
=Compounds are produced through different whole-number combinations of atoms.
=A chemical reaction results in the rearrangement of atoms in the reactant and product compounds.
Atomic theory has been revised over the years to incorporate the existence of atomic isotopes and the interconversion of mass and energy. In addition, the discovery of subatomic particles has shown that atoms can be divided into smaller parts. However, Dalton’s importance in the development of modern atomic theory has been recognized by the designation of the atomic mass unit as a Dalton.