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प्रश्न
Calculate the molar mass of the following substance:
Sulphur molecule, S8
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उत्तर
Molar mass of sulphur molecule, S8 = 8 × atomic mass of S
= (8 × 32) u
= 256 u
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संबंधित प्रश्न
One of the following elements has an atomicity of ‘one’. This element is :
Deduce the number of molecules of the following compound in the given quantity.
32g oxygen
Consider the following reaction and based on the reaction answer the questions that follow :
\[\ce{(NH4)2Cr2O7 ->[heat] N2(g) + 4H2O(g) + Cr2O3}\]
Calculate :
(i) The quantity in moles of (NH4)2Cr2O7 if 63 gm of (NH4)2Cr2O7 is heated.
(ii) The quantity in moles of nitrogen formed.
(iii) The volume in litres or dm3 of N2evolved at STP.
(iv) The mass in grams of Cr2O3 formed at the same time
[Atomic masses : H = 1, Cr=52, N=14]
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.
Define the term:
Gram atom
Calculate the number of moles of CO2 which contain 8.00 g of O2
Calculate the number of atoms in the following:
52 moles of He
Calculate the number of atoms in the following:
52 g of He
Four grams of caustic soda contains ______.
Solid ammonium dichromate decomposes as:
\[\ce{(NH4)2Cr2O7 -> N2 + Cr2O3 + 4H2O}\]
If 63 g of ammonium dichromate decomposes. Calculate the quantity in moles of nitrogen formed.
