# CHAPTER 1 – NUMERICALS

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NUMERICALS:

Q1:         60 gram CS2 is combusted by 80 gram O2 through the following reaction:

CS2+ 3O2 ——–> CO2 + 2SO2

find (a) Limiting Reactant (b) Volume of S02 produced at STP

Q2:         3 moles of CeH6 are reacted with 11 moles of Oxygen gas. Find out of (a) moles of CO2 produced (b) Mass of water produced at STP.

C6H6 + 7.5O2——–> 6CO2 + 3H20

Q3:         100 gram of KCIO3 is decomposed, find the volume of KCl produced at 300K and 1000 torr.

2KCIO3 ——–> 2KCI + 3O2 (K=39, CI-35.5, 0=16, S=32, C=12)

Q4:         Solve the following using exponential notation:

(i)           32600 + 6420 + 5423

(ii)          2.33×104 -12335

Q5:         Simplify according to the rules of significant figures:

 (i) 187 x 25 (ii) 3.98 + (4.9 – 0.22) 148.3 2.00

(ii)          30.5cm + 41cm + 0.013m

Q6:         A hydrocarbon has 20% hydrogen and 80% carbon. Find the empirical and molecular formulae of the compound, if the molecular mass is 30.

Q7:         Find the mass, number of moles, molecules and volume of C02 at STP, obtained by burning 0.010 Kg of carbon. Give also the equation.

396 x 41 2

 Q8: Find the value of following by the help of using Logarithm 396 x 41.2 (2.1)2

Q9:         Caffeine has the following %age composition:

Carbon 49.48%, Hydrogen 5.19%, Oxygen 16.48% and Nitrogen 28.85%. Its molecular weight is 194 gram/mole. Find its molecular formula (N=14)

Q10:       The density of Phosphene Gas is 1.26gram/ltr at 50oC and 747mm Hg. Assume that Phosphene behaves ideally, calculate its molecular mass.

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