Calculate the number of moles corresponding to 2.007 x 1028 atoms of helium.

Which of the following is most likely true about water in chemical solutions?

The biosphere of the earth is made up of what compound? organic or inorganic?

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)]