Given the balanced chemical reaction: 2Na+ s → Na2s
What is the total number of moles of sodium required to completely react with 0.50 moles of sulfur?

A) 2.0 mol
B) 1.0 mol
C) 0.5 mol
C) 4.0 mol

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

What was bohr’s contribution to the planetary model