[Felicity.L]

Hi, I received three questions for homework and I'm looking for somebody to double check it for me.  

1) How many grams of CaC₂ are needed to produce 1.00L of acetylene gas at 27 degrees and 100 kPa?

CaC + 2H₂O--> C₂H₂+ Ca(OH)

My solution/attempt:

T= 300 K
P=100 kPa
V=1.00 L
PV= nRT

(100)(100)=n(8.314)(300)
n= 0.0401

1:1 mole ratio
0.401x64.09
=2.57 g CaC₂

2) A pressure gague was inserted through the cap of a gigner ale bottle, and measured a pressure of 150 kPa at 20 degrees Celsius. The bottle was shaken and the pressure gague then read 250 kPa. What mass of carbonic acid decomposed? The volume of gas above the liquie was 27mL.

H₂CO₃--> CO₂+H₂O
P= 100 kPa
T=293 K
V=0.027 L

PV=nRT
(100)(0.027)=n(8.314)(293)
n= 0.001108
0.001108x62.03
=0.069 g H₂CO₃

3) A student is demonstration how "scrubbing" technology can remove sulfur dioxide from industrial smokestacks. Adrian starts with 1.00 L of SO₂ at 18 degrees celsius and 96.7 kPa/ What mass of powdered limestone does Adrian need to completely consume the sulfur dioxide gas?

SO₂ + CaCO₃ ---> CaSo₃+CO₂
V=1.00L
T=291K
P=96.7 kPa

PV=nRT
(96.7)(1.00)=n(8.314)(291)
n=0.0399
0.0399x100.088
=3.99g CaCO₃


Thanks for reading  

[Borek]

CaC + 2H₂O--> C₂H₂+ Ca(OH)

Huh? Also no such animal as CaSo₃, although that's most likely a typo.

But the final results look OK.

[Schrödinger]

CaC + 2H₂O--> C₂H₂+ Ca(OH)

Ca's valency is 2. So your formulae for the calcium compounds are wrong

[CHR!STY93]

CaC + 2H₂O--> C₂H₂+ Ca(OH)

Huh? Also no such animal as CaSo₃, although that's most likely a typo.

But the final results look OK.

I am guessing he meant CO2 + CaCO3.

[Borek]

I am guessing he meant CO2 + CaCO3.

I am afraid it makes even less sense.