20
which of these equations is balanced?
a. h2so4 + 2al --> al2(so4)3 + h2.
b. 2kcl + pb(no3) + pbcl2.

a.
b.
a and
b. neither.

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Calculate the frequency of a wave in a spring toy. the wave has a speed of 1.1 meters per second and a wavelength of 0.1 meters. *