Answer : The formic acid pressure is, 99 torr
Explanation :
The given chemical reaction is:

Initial pressure a 0 0
At time 't' (a-x) x x
According to the Dalton's law,

.........(1)
As we are given that:
Initial pressure = a = 220 torr

Now put the value of 'a' in equation 1, we get:



Thus, the formic acid pressure is, 99 torr
Density = Mass / Volume
Density = 2.0g / 5.0ml
Density = 0.4 g/ml
I got the answer was B because to make a circuit work, you need all of the ends attached. Hope I helped!
Answer:
c) none of them
Explanation:
because H20, N2 , O2 are all molecules except NaCl so there is no answers like ( 1, 3, and4 ) so we choose none of them.