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Sagot :
Answer:
0.282 moles
Explanation
I assume you meant How many moles is 1.7 × 10^23 atoms of Ne?
1 mole is 6.02X10^23 .Avogados number=
(1.7X10^23)/(6.02X10^23)= 0.282 moles
Answer:
[tex]\boxed {\boxed {\sf 0.28 \ mol \ Ne}}[/tex]
Explanation:
We are asked to find how many moles are in 1.7×10²³ atoms of Ne or neon.
Atoms are converted to moles using Avogadro's Number or 6.022 ×10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. For this problem, the particles are atoms of neon.
We convert using dimensional analysis, so a conversion factor (using Avogadro's Number) must be set up.
[tex]\frac {6.022 \times 10^{23} \ atoms \ Ne}{ 1 \ mol \ Ne}[/tex]
We are converting 1.7×10²³ atoms of Ne to moles, so we multiply the ratio by this value.
[tex]1.7 \times 10^{23} \ atoms \ Ne *\frac {6.022 \times 10^{23} \ atoms \ Ne}{ 1 \ mol \ Ne}[/tex]
Flip the ratio so the units of atoms of neon cancel out.
[tex]1.7 \times 10^{23} \ atoms \ Ne *\frac { 1 \ mol \ Ne}{6.022 \times 10^{23} \ atoms \ Ne}[/tex]
[tex]1.7 \times 10^{23} *\frac { 1 \ mol \ Ne}{6.022 \times 10^{23} }[/tex]
[tex]\frac { 1.7 \times 10^{23}}{6.022 \times 10^{23} } \ mol \ Ne[/tex]
Divide.
[tex]0.2822982398 \ mol \ Ne[/tex]
The original measurement of atoms (1.7×10²³) has 2 significant figures (1 and 7). Our answer must also have 2 significant figures. For the number we found, that is the hundredth place.
The 2 in the thousandth place tells us to leave the 8 in the hundredth place.
[tex]0.28 \ mol \ Ne[/tex]
1.7×10²³ atoms of Neon are equal to approximately 0.28 moles of neon.
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