![]() The study revealed that the material validity by the material expert was 91,5%, and the validity by the media expert was 92,5%. The data was analyzed by using Likert scale. Data collecting technique used were questionnaire and test. Subject in this research were students of class X IPA 2 as many as 9 students at initial field trials and 30 students of X IPA 1 at main field trials. This study was a R &D method which adopting development of Brog & Gall. This study aimed to develop a learning module of multiple representation-based Stoichimetry concept. Lack of analytical skills and reasoning of the material taught especially stoichiometric material leads to a lack of interest in students' learning, students do not have a handbook but while learning takes place students use an inadequate number of textbooks in addition to covering only one or two representations. Students’ understanding towards learning materials is generally influenced by the learning sources used. ![]()
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