The ratio of the number of molecules in 2g of hydrogen to that in 16g of oxygen is
2:1
1:1
1:2
1:4
1:8
Explanation
No explanation available
Video Explanation
No video available
Post your Contribution
Discussions (17)
No of moles of hydrogen(H2)
=mass of H2/molar mass of H2
=2g/1=2
no of moles of oxygen(O2)
=mass of O2/molar mass of O2
=16g/16=1
then ratio of n(H2) to n(O2)= 2/1 =2:1
recall that molar mass of H2 is 1 and dat of O2 is 16...
was it helpful?
we are talking about molecules and not atoms...
one molecule of hydrogen contain 2g and one molecule of oxygen contains 32g so....
the number of molecules in 2g of hydrogen is 2g/2g=1 molecule
while the number of molecules in 16g of oxygen is 16g/32g=0.5 molecule
the ratio of the hydrogen to the oxygen is 1: 0.5 which is the same thing as 2:1
2H2+O2->H2O. From the above equation, it require 2moles of hydrogen to react with 1 mole of oxygen so as to give water . so its 2:1 respectively
Here's how to solve this problem:
1. Calculate the number of moles for each gas:
* Hydrogen (H₂):
* The molar mass of H₂ is 2 g/mol.
* Number of moles = mass / molar mass = 2 g / 2 g/mol = 1 mol.
* Oxygen (O₂):
* The molar mass of O₂ is 32 g/mol (16 g/mol per oxygen atom x 2).
* Number of moles = mass / molar mass = 16 g / 32 g/mol = 0.5 mol.
2. Relate moles to the number of molecules:
* Avogadro's number states that 1 mole of any substance contains 6.022 x 10²³ molecules.
* Therefore the number of molecules is proportional to the number of moles.
3. Determine the ratio:
* Ratio of moles of H₂ to O₂ = 1 mol : 0.5 mol = 2 : 1.
* The ratio of molecules is the same as the ratio of moles.
Therefore, the ratio of the number of molecules in 2g of hydrogen to that in 16g of oxygen is 2:1.
Final Answer: The final answer is \boxed{A}
Here is an explanation:
The number of moles =mass/molar mass therefore for hydrogen 2/1 :oxygen 16/16 = 2:1 ¤
REF: Check new school chemistry stoichiometry
@ALISHA the molar mass of hydrogen is 1.............................it's the oxidation number of oxygen that is -2 not 2
Lol it's 1:1
Please don't get it twisted. A molecule of hydrogen contains 2g. Not one
