Some mole problems!
Which quantity of neon may be represented by the symbol Ne?
A) 1 gram B) 4 liters C) 6 x 1023 atoms D) 2 moles
A sample of nitrogen containing 1.5 x 1023 molecules has the same number of molecules as a sample containing
A) 1.0 mole of H2 B) 0.25 mole of O2 C) 0.50 mole of Ne D) 2.0 moles of He
Please explain how you got the answer. Thankss!
1)Ne usually means 1 mole of Ne. How many atoms is that?
2) How many moles? remembering that 1 mole of molecules is 6.02E23 molecules.
1.5E23/6.02E23 = 0.25 moles.
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The symbol Ne represents neon, so we need to determine which quantity can be represented by this symbol.
Option A) 1 gram does not represent neon, so it is not the correct answer.
Option B) 4 liters does not represent neon, so it is not the correct answer.
Option C) 6 x 10^23 atoms is the Avogadro's number, which represents 1 mole of any substance, including neon. So, this is a correct representation of neon and is the correct answer.
Option D) 2 moles does represent a quantity of neon, but it is not specifically represented by the symbol Ne. So, it is not the most accurate answer.
Therefore, the correct answer is C) 6 x 10^23 atoms.
Regarding the second question, let's analyze the given options to determine which one has the same number of molecules as a sample containing 1.5 x 10^23 molecules of nitrogen.
Option A) 1.0 mole of H2: The mole ratio between H2 and N2 (nitrogen) is 1:1. Hence, 1 mole of H2 also contains 6 x 10^23 molecules. So, this option matches the given quantity of nitrogen and is a correct answer.
Option B) 0.25 mole of O2: The mole ratio between O2 and N2 is 2:1. Therefore, 0.25 mole of O2 contains (0.25 * 2) = 0.5 mole of N2, which is not the same quantity as the given nitrogen sample.
Option C) 0.50 mole of Ne: Neon is a different substance from nitrogen, so the number of neon molecules in 0.50 mole of Ne will not be the same as the given nitrogen sample.
Option D) 2.0 moles of He: Helium is also a different substance from nitrogen, so the number of helium molecules in 2.0 moles of He will not be the same as the given nitrogen sample.
Therefore, the correct answer is A) 1.0 mole of H2, as it contains the same number of molecules.
To answer these questions, we need to understand the concept of moles and how it relates to the quantity of a substance.
The mole is a unit used in chemistry to measure the amount of a substance. One mole of any substance contains 6.022 x 10^23 particles, which is known as Avogadro's number.
Now let's solve the first problem: Which quantity of neon may be represented by the symbol Ne?
A) 1 gram - This option represents the mass of neon, not the amount of neon. To represent an amount of a substance, we need to use moles.
B) 4 liters - This option represents the volume of neon gas, not the amount of neon.
C) 6 x 10^23 atoms - This option represents the correct amount of neon since 6 x 10^23 atoms is equivalent to 1 mole of neon.
D) 2 moles - This option represents the amount of neon correctly since it specifies 2 moles.
Therefore, the answer to the first question is C) 6 x 10^23 atoms.
Now let's solve the second problem: A sample of nitrogen containing 1.5 x 10^23 molecules has the same number of molecules as a sample containing
A) 1.0 mole of H2 - To determine if the given sample has the same number of molecules, we need to check if it is equal to 6.022 x 10^23 molecules, which is equal to 1 mole. Since 1.5 x 10^23 molecules is less than 6.022 x 10^23 molecules, this option is incorrect.
B) 0.25 mole of O2 - The same reasoning applies here. 1.5 x 10^23 molecules is more than 0.25 mole of O2 (which is equal to 1.505 x 10^23 molecules), so this option is also incorrect.
C) 0.50 mole of Ne - The given sample contains 1.5 x 10^23 molecules. As 0.50 mole of Ne is equal to 3.011 x 10^23 molecules, this option is incorrect.
D) 2.0 moles of He - This option states that 2 moles of helium contain the same number of molecules as the given sample. Since 2 moles of any substance contain 2 x 6.022 x 10^23 molecules, which is greater than 1.5 x 10^23, this option is also incorrect.
Therefore, none of the options are correct for the second question.
I hope this explanation helps! Let me know if you have any further questions.