Abstract
This research was a descriptive research. The research respondents were 30 students of class XI IPA-5 SMA Negeri 2 Sampit for the 2018/2019 academic year. The research data was obtained through lesson plans, tests, and interviews. The results showed that the average mastery of students' concepts was 64% and was in the medium category. 40% (12 students) of concept mastery are in the high category, 36.67% (11 students) are in the medium category and 23.33% (7 students) are in the low category. As many as 86% (in the high category) students were able to convert the number of moles to the number of particles, mass and volume of substances with mastery of. Meanwhile, 30% (in the low category) students are able to apply the mole concept in solving chemical calculations with mastery of concepts.
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