CAN SOMEONE PLS HELP what is the percentage of chloromethane in the water if a maximum of 0,4 dm3 of chloromethane is soluble in 100 m3 of water

Iknow #2 is d. i just need to know why

Which type of orbits are found in the principal energy level n = 2 a - s b - s, f c - s, d d - s, p e - s, p, d

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