which one of the following is the lightest 0.2 mole of hydrogen gas these 6.023 into 10 raise to power 22 molecules of Nitrogen she is 0.1 gram of silver and 30. 1 mole of Oxygen gas by unitary method
Answers
Answer:
Answer: The correct answer is Option a.
Explanation:
To calculate the mass of the given compound, we use the equation:
\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}Number of moles=Molar massGiven mass ....(1)
For a: 0.2 moles of H_2H2 gas
Moles of hydrogen gas = 0.2 mol
Molar mass of hydrogen gas = 2 g/mol
Putting values in equation 1, we get:
\begin{lgathered}0.2=\frac{\text{Mass of }H_2\text{ gas}}{2g/mol}\\\\\text{Mass of }H_2\text{ gas}=0.4g\end{lgathered}0.2=2g/molMass of H2 gasMass of H2 gas=0.4g
Mass of hydrogen gas = 0.4 grams
For b: 6.023\times 10^{22}6.023×1022 molecules of nitrogen
According to mole concept:
6.022\times 10^{23}6.022×1023 molecules constitute 1 mole of a substance
So, 6.023\times 10^{22}6.023×1022 molecules will occupy = \frac{1}{6.022\times 10^{23}}\times 6.023\times 10^{22}=0.1mol6.022×10231×6.023×1022=0.1mol
Molar mass nitrogen = 14g/mol
Putting values in equation 1, we get:
\begin{lgathered}0.1=\frac{\text{Mass of nitrogen}}{14g/mol}\\\\\text{Mass of nitrogen}=1.4g\end{lgathered}0.1=14g/molMass of nitrogenMass of nitrogen=1.4g
Mass of nitrogen = 1.4 grams
For c: 0.1 g of silver
It is given only silver has 0.1 grams of mass.
For d: 0.1 mole of oxygen gas
Moles of oxygen gas = 0.1 mole
Molar mass of oxygen gas = 32g/mol
Putting values in equation 1, we get:
\begin{lgathered}0.1mol=\frac{\text{Mass of oxygen gas}}{32g/mol}\\\\\text{Mass of oxygen gas}=3.2g\end{lgathered}0.1mol=32g/molMass of oxygen gasMass of oxygen gas=3.2g
Mass of oxygen gas = 3.2 grams
For e: 1 g of water
it is given that the mass of water is 1 grams.
From the above calculation, we conclude that the lightest compound is hydrogen gas.
Hence, the correct answer is Option a.
Answer:
answer is c
Explanation:
Mass of hydrogen gas = 0.4 grams
Mass of nitrogen = 1.4 grams
It is given only silver has 0.1 grams of mass.
Mass of oxygen gas = 3.2 grams
thus silver here is the lightest