Advertisements
Advertisements
प्रश्न
Solve problem:
A student used a carbon pencil to write his homework. The mass of this was found to be 5 mg. With the help of this calculate the number of moles of carbon in his homework writing.
Advertisements
उत्तर
5 mg carbon = 5 × 10-3 g carbon
Atomic mass = 12 u
∴ Molar mass of carbon = 12 g mol-1
No. of moles = `"Mass of substance"/"Molar mass of substance"`
= `(5 xx 10^-3)/(12 "g" "mol"^-1)`
= 4.167 × 10-4 mol
APPEARS IN
संबंधित प्रश्न
What is meant by the molar volume of a gas?
Solve problem:
Calculate the number of moles of hydrogen in 0.448 litre of hydrogen gas at STP.
Solve problem:
A student used a carbon pencil to write his homework. The mass of this was found to be 5 mg. With the help of this calculate The number of carbon atoms in 12 mg of his homework writing
In two moles of acetaldehyde \[\ce{CH3CHO}\] calculate the number of moles of carbon.
Solve problem:
In two moles of acetaldehyde (CH3CHO) calculate the number of moles of hydrogen
Solve problem:
In two moles of acetaldehyde (CH3CHO) calculate the number of moles of oxygen
Solve problem:
In two moles of acetaldehyde (CH3CHO) calculate the number of molecules of acetaldehyde
Mole is the SI unit of ____________.
Isothermally and reversibly one mole of neon expands from 2 m3 to 20 m3 and produces 831.4 J of work. The temperature at which expansion takes place is ____________.
(R = 8.314 J K-1 mol-1)
The volume in dm3 occupied by 15.0 g of ethane at STP is ____________.
Calculate the total volume occupied by 48 g oxygen and 42 g nitrogen at STP.
What will be the volume of oxygen gas produced, if the reaction \[\ce{2KClO_{3(s)} -> 2KCl_{(s)} + 3O_{2(g)}}\]; ΔH° = - 78 kJ is carried out at S.T.P.?
How many moles of methane are present in 11.2 Lat S.T.P.?
Which gas among the following contains a maximum number of molecules at STP?
(Molar masses in g mol-1 : CO2 = 44, Ar = 39.9, CH4 = 16, O2 = 32)
