The molar mass of water (H2O) is 18. 02 g/mol. Yun needs 0. 025 mol H2O for a laboratory experiment. She calculates that she needs 72. 0 g H2O for the experiment. Is she correct? Answer without doing any calculations.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

i think the answer is terrae but not 100 percent sure. ▓▬▬ §

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )

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