10.0 s
12.5 s
17.7 s
32.0 s
Correct answer is B
100 cm3 of O2 diffuse 50 sec
∴ 100 cm3 of H2 → (100) / (100) x (50) /(1)
t1 50 sec
molecular mass H+ → 2 x 1 = 2
molecular mass of O2 16 x 2 = 32
T2 = t1 √M2/M1 = t2 = 50 √2/32
50√0.625 = 50 x 0.25 = 12.5 secs
Which of the following is a measure of the average kinetic energy of the molecules of a substance?
Volume
Mass
pressure from age grades
Temperature
Correct answer is D
No explanation has been provided for this answer.
400 k
480 k
550 k
600 k
Correct answer is D
No explanation has been provided for this answer.
2,2,5 and 1
3,2,5 and 2
3,2,6 and 1
2,2,6 and 2
Correct answer is C
No explanation has been provided for this answer.
How many moles of (H+) are there in 1 dm3 of 0.5 M solution of H2SO4?
2.0 moles
1.0 moles
0.5 mole
0.25 mole
Correct answer is B
mole = (M x V ) / (1000cm3) = (0.5 x 1000cm3) = 0.5 moles
For H2SO4 → 2H+SO42-
1 mole of H+ = 0.5 moles
2H+ = 2 x 0.5 mole = 1.0 mole