Which of the following elements probably has the most properties in common with lead (pb)?
a. tin (sn)
b. copper (cu)
c. rubidium (rb)
d. gold (au)

What pressure will be exerted by 0.675 moles of a gas at 25*c if it is in a 0.750-l container?

Stage in which a typical star has completely stopped fusion

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]