Advertisements
Advertisements
Question
Calculate the percentage of water of crystallization in CuSO4.5H2O
(H = 1, O = 16, S = 32, Cu = 64)
Advertisements
Solution
Given :
Atomic mass of H 1
Atomic mass of O 16
Atomic mass of S 32
Atomic mass of Cu 64
Molar mass of CuSO4.5H2O (64) + (32) + (9 x 16) + (10 x 1)
= 250
Molar mass of five water molecules (10 x 1) + (5 x 16)
= 90
Percentage of water of crystallization = `(90 xx 100)/250` = 36% water of crystallization.
APPEARS IN
RELATED QUESTIONS
Calculate the molar mass of the following substance:
Ethyne, C2H2
One of the following elements has an atomicity of ‘one’. This element is :
Explain with examples what is meant by a 'mole' of a substance.
What is the value of 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
Calculate the mass of 0.1 mole of carbon dioxide.
[Atomic mass: S = 32, C = 12 and O = 16 and Avogadro's number = 6 × 1023]
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]
Cost of Sugar (C12H22 O11) is Rs 40 per kg; calculate its cost per mole.
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.
Deduce the number of molecules of the following compound in the given quantity.
90g water
