The length of a pencil is measured with two rulers. Report the length of the pencil from each ruler with the proper number of digits. The ruler has markings at 0, 1, and 2 decimeters. The pencil extends from 0 d m to approximately one third of the way between 1 and 2 d m. The ruler has major markings at 0, 1, and 2 decimeters. Between each major marking the space is divided into ten equally sized divisions. The pencil extends from 0 d m to approximately one third of the distance between 1 and 2 d m. Ruler A Ruler B

answer seismograph;

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