Advertisements
Advertisements
प्रश्न
How many grams are there in the following?
4 moles of the phosphorous molecule, P4
Advertisements
उत्तर
Formula = No. of moles (n) × (Gram molecular mass)
4 moles of the phosphorous molecule, P4
Mass of 1 mole of phosphorous molecule = 30.97 g
Mass of 4 moles of phosphorous molecules = 30.97 × 4 = 123.88 g.
APPEARS IN
संबंधित प्रश्न
Calculate the molar mass of the following substance:
Phosphorus molecule, P4 (atomic mass of phosphorus = 31)
Calculate the molar mass of the following substance:
Hydrochloric acid, HCl
Fill in the following blanks :
64 g of oxygen gas contains ................ moles of oxygen atoms.
Define the term:
Avogadro’s number
Given that the relative molecular mass of copper oxide is 80, what volume of ammonia (measured at STP) is required to completely reduce 120g of copper oxide? The equation for the reaction is :
3CuO + 2NH3 → 3Cu + 3H2O + N2
A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure.
(a) Find the number of moles of hydrogen present
(b) What weight of CO2can the cylinder hold under similar conditions of temperature and pressure? (H = 1 C = 12, O = 16)
(c) If the number of molecules of hydrogen in the cylinder is X, calculate the number of CO2 molecules in the cylinder with the same conditions of temperature and pressure.
(d) State the law that helped you to arrive at the above result.
What is the value of molar volume of a gas at S.T.P?
Calculate the number of moles of CO2 which contain 8.00 g of O2
Calculate the number of atoms in the following:
52 amu of He
Calculate the number of oxygen atoms in 0.10 mole of Na2CO3 . 10H2O.
