Qb) i) Calculate the mass of residue obtained by heating 2.7 g. Ag2CO1 ? [ Ag = l08 C= 12 O = 16]
ii) How many moles of water are in 720 g of it ?
iii) Calculate the number of atoms in 8 g of helium gas at STP.
iv) KCIO3 on heating decomposes to give KCl and oxygen. What is the volume of O2 at stp liberated by 0.1 mole of KClO3.
Silver carbonate decomposes as:
2Ag2CO3 (s) → 4Ag (s) + 2CO2 (g) + O2 (g)
molar mass ofAg2CO3 = 276 g
molar mass ofAg = 108g
According to the equation 2 mol ofAg2CO3 gives 4 moles of Ag
552 g of AgNO3 gives 432 g of Ag (residue)
2.76 g of AgNO3 gives g of Ag (residue)
Kindly post remaining query in next thread.
ii) 39.966073244495995 will be the number of moles in 720 grams of water
To solve this problem, we can first convert the given mass of
At standard temperature and pressure conditions (
Therefore, using dimensional analysis again,
this is for 10 you can substitute 10 with 8 and do the calculation
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