Hich of the following equations is balanced correctly?

a.
2 c2h2 + 5 o2 → 4 co2 + 2 h2o

b.
3 h2o → h2 + 3 o2

c.
2 c3h3 + o2 → 2 co2 + h2o

d.
cl2 + 2 kbr → kcl + br2

Agas expands from an initial volume of 0.040 m^3 and an initial pressure of 210 kpa to a final volume of 0.065 m^3 while its temperature is kept constant. how much work is done by the system?

Distinguish between linear momentum and angular momentum

Point charges q1=+2.00μc and q2=−2.00μc are placed at adjacent corners of a square for which the length of each side is 1.50 cm . point a is at the center of the square, and point b is at the empty corner closest to q2. take the electric potential to be zero at a distance far from both charges. part a what is the electric potential at point a due to q1 and q2? express your answer with the appropriate units.