Question

In an experiment during the analysis of a carbon
compound, 145 mL of H2 was collected at 760 mm Hg
pressure and 27°C. The mass of Hy is nearly:
(a) 10 mg
(b) 6g
(c) 12 mg
(d) 12 g​

Answer 1

Answer:

(C)

Explanation:

We know that

145 cm^3 = 145 ml = 0.145L

760 mm of hg = 1 atm

PV = NRT

N = given mass / molecular mass ( in this case 2)

Therefore

1 × 0.145 = mass / 2 × R × 300

( 27° C = 273 + 27 = 300 k , R = 0.08206)

M = 0.145 × 2 / 0.08206 × 300

= 0.01177g

= 0.1177 × 1000 = 11.77mg which is approximately equal to 12mg

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