What is the mass of 6.25 moles of Ca(OH)2?

Which of the following electromagnetic waves can create ions?

1. if you have a gas at 127 degrees c, what is it's absolute temperature (kelvin)? a. 200kb. 300kc. 400kd. 500k2. if you had a gas whose absolute temperature measured 45 k, what is that temperature in celsius? a. -228 cb. -300 cc. 125 cd. 112 c

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?