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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
States of Matter

NTA Abhyas 2020 · Chemistry · States of Matter

Calculate the number of hours of service that can be derived at 1...

Calculate the number of hours of service that can be derived at 1 atm, 300K300K from an acetylene lamp containing 640g640g calcium carbide. Given that the lamp requires 50L50L acetylene gas at 1 atm 300K300K for one hour. [Take 0.0821×300=25]0.0821 \times 300 = 25]

Correct answer

5

Step-by-step solution

CaC2+2H2O→Ca(OH)2+C2H2\text{C}\text{a}{\text{C}}_{2} + 2{\text{H}}_{2}\text{O} \to \text{C}\text{a}{\left(\text{O}\text{H}\right)}_{2} + {\text{C}}_{2}{\text{H}}_{2}

moles of CaC2=64064=10\text{C}\text{a}{\text{C}}_{2} = \dfrac{640}{64} = 10

∴∴ moles of C2H2 formed = 10

∴VC2H2∴ {\text{V}}_{{\text{C}}_{2} {\text{H}}_{2}} = 10 × 0.0821 × 300 = 250 Litres

∴∴ number of hours = 25050=5\dfrac{250}{50} = 5
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