The pressure exerted by a gas is a function of the
total volume of the gas
speed of the gaseous molecules
mass of each gaseous molecule
frequency of collision between gaseous molecules
Correct answer is D
No explanation has been provided for this answer.
Which of the following phenomenna lead to decrease in volume of a liquid in an open container?
Brownian motion
Diffusion
Evaporation
Sublimation
Correct answer is C
No explanation has been provided for this answer.
The gas law which describes the relationship between volume and temperature is
Boyle's law
Charles' law
Dalton's law
Graham's law
Correct answer is B
No explanation has been provided for this answer.
The percentage by mass of calcium in Ca(OCI)2 is [Ca = 40.0; CI = 35.5; O = 16.0]
28.0%
31.6%
43.8%
44.5%
Correct answer is A
Molar mass of \(Ca(OCl)_2\) = 40 + (16 + 35.5)x2 = 143
% by mass of calcium in the compound =\(\frac{mass of calcuim}{molar mass of compound}\) x 100%
% calcium = \(\frac{40}{143} \times100\)
= 27.98% = 28%
464.30 cm3
625.00 cm3
1000.00 cm3
2153.80 cm3
Correct answer is A
number of moles = molar concentration x volume(\(dm^3\))
molar concentration(C) = 0.25mol/dm3, volume = ? and number of mole(n) = \(\frac{mass}{molar mass}\) = \(\frac{6.5}{56}\) ( where 56g/mol = molar mass of KOH)
\(\frac{6.5}{56}\) = 0.25 x V
V = \(\frac{0.11607}{0.25}\) = 0.46428dm^3 → 464.3cm^3