Advertisements
Advertisements
Question
What temperature would be necessary to double the volume of a gas initially at s.t.p. if the pressure is decreased by 50%?
Advertisements
Solution
P1 = 1 atm
P2 = `1 xx 50/100 = 1/2` atm
V1 = x cc
V2 = 2x cc
T1 = 273 K
T2 = ?
Using gas equation `("P"_1"V"_1)/"T"_1 = ("P"_2"V"_2)/"T"_2`
∴ T2 = `("P"_2"V"_2"T"_1)/("P"_1"V"_1)`
`"T"_2 = 1/2 xx (2"x" xx 273)/(1 xx "x") = 273` K
T1 = 273 - 273 = 0°C
RELATED QUESTIONS
What is the value of molar volume of a gas at STP?
(NH4)2Cr2O7 → N2 + Cr2O3 +4H2O.
What volume of nitrogen at STP, will be evolved when 63g of ammonium dichromate is decomposed?
(H= 1, N = 14, 0 = 16, Cr = 52)
The gases hydrogen, oxygen, carbon dioxide, sulphur dioxide and chlorine are arranged in order of their increasing relative molecular mass. Given 8 g of each gas at STP, which gas will contain the least number of molecules and which gas the
most?
Calculate the volume of 320g of SO2 at STP .
(Atomic mass : S = 32 and O = 16)
Complete the following calculations. Show working for complete credit :
If 6 litres of hydrogen and 4 litres of chlorine are mixed and exploded and if water is added to the gases formed, find the volume of the residual gas.
When carbon dioxide is passed over red hot carbon, carbon monoxide is produced according to the equation :
\[\ce{CO2 + C -> 2CO}\]
What volume of carbon monoxide at S.T.P. can be obtained from 3 g of carbon?
The equation given below relates the manufacture of sodium carbonate (molecular weight of Na2CO3 = 106).
- NaCl+NH3+ CO2+ H2O→ NaHCO3+NH4Cl
- 2NaHCO3→ Na2CO3+H2O + CO2
Equations (1) and (2) are based on the production of 21.2 g of sodium carbonate.
(a) What mass of sodium hydrogen carbonate must be heated to give 21.2 g of sodium carbonate?
(b) To produce the mass of sodium hydrogen carbonate calculate in (a), what volume of carbon dioxide, measured at S.T.P. would be required?
The following experiment was performed in order to determine the formula of a hydrocarbon. The hydrocarbon X is purified by fractional distillation.
0.145 g of X was heated with dry copper (II) oxide and 224 cm3 of carbon dioxide was collected at S.T.P.
Which elements does X contain?
Which will have greater volume when the following gases are compared at STP:
- 1.2/N2 at 25°C and 748 mmHg
- 1.25/O2 at STP
Which of the following would occupy 22.4 litres at S.T.P.?
- 32 g of oxygen gas
- 2 moles of hydrogen gas
- 6.022 × 1023 molecules of ammonia
[Atomic weights: O = 16, H = 1, N = 14]
