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प्रश्न
Fill in the following blanks :
0.5 mole of calcium element has a mass of ............... .
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उत्तर
0.5 moles of calcium element have a mass of 20g.
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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:
Nitric acid, HNO3
- The percentage composition of a gas is:
Nitrogen 82.35%, Hydrogen 17.64%. - Find the empirical formula of the gas. [N = 14, H = 1]
Define the term:
Avogadro’s number
The equation for the burning of octane is:
\[\ce{2C8H18 + 25O2 -> 16CO2 + 18H2O}\]
- How many moles of carbon dioxide are produced when one mole of octane burns?
- What volume, at STP, is occupied by the number of moles determined in (a)?
- If the relative molecular mass of carbon dioxide is 44, what is the mass of carbon dioxide produced by burning moles of octane?
- What is the empirical formula of octane?
Calculate the number of atoms in the following:
52 moles of He
Calculate the number of atoms in the following:
52 g of He
The molecular formula for elemental sulphur is S8.In a sample of 5.12 g of sulphur:
How many molecules and atoms are present?
Four grams of caustic soda contains ______.
The number of atoms present in 0.1 mole of P4 (at. mass = 31) is ______.
