Advertisements
Advertisements
प्रश्न
Calculate the number of oxygen atoms in 0.10 mole of Na2CO3 . 10H2O.
Advertisements
उत्तर
1molecule of Na2CO3 . 10H2O contains oxygen atoms = 13
So, 6.023 × 1023 molecules (1 mole) has atoms = 13 × 6.023 × 1023
So, 0.10 mole will have atoms = 0.1 × 13 × 6.02 × 1023
= 7.826 × 1023
APPEARS IN
संबंधित प्रश्न
Convert into mole.
22 g of carbon dioxide
How many moles are there in 34.5 g of sodium ? (Atomic mass of Na = 23 u)
Calculate the mass in grams of 0.17 mole of hydrogen sulphide, H2S. (Atomic masses : H = 1 u, S = 32 u)
Fill in the blank.
One a.m.u. is the mass of ______ atom of C12.
Complete the following calculations. Show working for complete credit :
Calculate the mass of calcium that will contain the same number of atoms as are present in 3.2 gm of Sulphur. [Atomic masses : S = 32, Ca = 40]
How many grams of H2O are present in 0.2 mole of it?
From the equation for burning of hydrogen and oxygen
\[\ce{2H2 + O2 -> 2H2O}\] (Steam)
Write down the number of mole (or moles) of steam obtained from 0.5 moles of oxygen.
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.
One mole of any gas occupies ______ ml at S.T.P.
Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of magnesium is 24g mol–1.
