The number of moles of hydrogen atom in one glass of water (500cm3) is approximately equal to
(density = 1g/cm)
A )13 .8 mol
B) 27.7 mol
C)55 .5 mol
D) 24.6 mol
Answers
Answer:
b option is correct answer
Answer:
To get the number of moles per liter of water, we divide the mass of 1L of water (1000g) by the mass of a mole of water (18g / mole). 1000 / 18 = 55+5/9 moles.
therefore in the same way to get the number of moles of H2O in 500cm^3 of water
==> density=mass/volume
==>500cm^3=500g of water
Always use this formula to get anything
: moles=molar mass=no. of particles in 1mole=volume at stp(if liquid or gas)
like take the example of H2O
1 mol=18g=6*10^23 molecules=22.4litre at stp
therfore, by the expression: we conclude that
No. of moles which 500g of H2O constitutes= given mass/Molar mass
=500/18=27.77mol
but we have 2:1 ratio of number of atoms of H:O
=>(2*27.77 of H atom +1*27.77 mol of O atom)=27.77mol of H2O molecules.
Hence option c is correct answer because 27.77*2mol=55.55mol which is the required answer here.
You may refer to Concise Chemistry part 1(meant for class 9th icse ) for more detailed matter on the same concept in the chapter Mole Concept.
It is a very useful book .
Thank u and kindly mark me brainliest if found my answer useful and appropriate.