Which substance has the highest particle mobility?

water at 25 °c because liquid particles are the most mobile and mobility increases with decreasing temperature
steam at 105 °c because gas particles are the most mobile and mobility increases with increasing temperature
nitrogen gas at -200 °c because gas particles are the most mobile and mobility increases with decreasing temperature
ethyl alcohol at 30 °c because liquid particles are the most mobile and mobility increases with increasing temperature

it should be all of them because it asks if you included all of those in your answer

explanation:

if you mean hydrogen and oxygen then water is the product

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o