Chemistry, 06.03.2021 06:00 zamirkid7337

How many moles are there in 3.01x10^24 atoms of argon?

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Answer from: jasmne4713

$\boxed {\boxed {\sf 5.00 \ mol \ Ar }}$

Explanation:

To convert from mole to atoms, we must use Avogadro's Number: 6.022*10²³. This number tells us the particles (atoms, ions, molecules, etc.) in 1 mole of a substance. In this case, the particles are atoms of argon.

Let's create a ratio.

$\frac {6.022*10^{23} \ atoms \ Ar}{1 \ mol \ Ar}$

Multiply by the given number of atoms.

$3.01*10^{24} \ atoms \ Ar *\frac {6.022*10^{23} \ atoms \ Ar}{1 \ mol \ Ar}$

Flip the fraction so the atoms of argon will cancel.

$3.01*10^{24} \ atoms \ Ar *\frac {1 \ mol \ Ar}{6.022*10^{23} \ atoms \ Ar}$

$3.01*10^{24} *\frac {1 \ mol \ Ar}{6.022*10^{23}}$

$\frac {3.01*10^{24} \ mol \ Ar}{6.022*10^{23}}$

$4.998339422 \ mol \ Ar$

The original measurement of atoms has 3 significant figures, so our answer must have the same. For the number we calculated, that is the hundredth place. The 8 in the thousandth place tells us to round the 9 to a 0, which also rounds the 9 in the tenths place to a 0, then the 4 to a 5.

$5.00 \ mol \ Ar$

There are 5.00 moles of argon.

Answer from: Quest

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

Answer from: Quest

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.

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