The half-life of hydrogen-3 is approximately 12.3 years. How long will it take for a sample of hydrogen-3 to reach 4% of its original mass?
Which answer choice?

• 16.3 yr
• 33.1 yr
• 48.6 yr
• 57.2 yr

What happens when an acid dissolves?

Three alkali metals in group 1 are a. calcium, strontium, barium b. boron, aluminum, gallium c. sodium, potassium, rubidium d. fluorine, iodine, chlorine

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