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प्रश्न
Define the term:
Relative molecular mass
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उत्तर
The relative molecular mass of a compound is the number that represents how many times one molecule of the substance is heavier than `1/12` of the mass of an atom of carbon 6C12.
संबंधित प्रश्न
Convert into mole.
20 g of water
Convert into mole.
22 g of carbon dioxide
What name is given to the amount of substance containing 6.022 × 1023 particles(atoms,molecules or ions) of a substance ?
If 0.2 mol of the following substance is required how many grams of that substance should be taken?
Sodium chloride
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 mass of 0.1 mole of the following:
CaCO3
(Ca = 40, Na = 23, Mg = 24, S = 32, C = 12, Cl = 35.5, O = 16, H = 1)
The molecular formula for elemental sulphur is S8. In a sample of 5.12 g of sulphur:
How many moles of sulphur are present?
Solid ammonium dichromate decomposes as under:
\[\ce{(NH4)2Cr2O7 -> N2 + Cr2O3 + 4H2O}\]
If 63 g of ammonium dichromate decomposes. Calculate;
- the quantity in moles of (NH4)2Cr2O7
- the quantity in moles of nitrogen formed
- the quantity in moles of nitrogen formed
- the loss of mass
- the mass of chromium (III) oxide formed at the same time.
Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of magnesium is 24g mol–1.
