Aballoon contains 46.3 l of helium at 42 oc, and 2.01 atm is released into the air. at a certain altitude, the temperature falls to 21 oc, and the pressure falls to 0.25 atm. what is the volume of the balloon under these conditions? a. 3.5 l b. 35.0 l c. 347.5 l d. 3475.0 l e. none of the above

Calculate the enthalpy of the following reaction: 4 b (s) + 3 o2 (g) → 2 b2o3 (s) given the following pertinent information: (a) b2o3 (s) + 3 h2o (g) → 3 o2 (g) + b2h6 (g), δhoa = +2035 kj (b) 2 b (s) + 3 h2 (g) → b2h6 (g), δhob = +36 kj (c) h2 (g) + latex: \frac{1}{2} 1 2 o2 (g) → h2o (l), δhoc = −285 kj (d) h2o (l) → h2o (g), δhod = +44 kj

What must happen before a body cell can begin mitotic cell division

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space