Riska, Cut S, Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)
Riyanta, Aldi Budi, Politeknik Harapan Bersama, Tegal City, Central Java (Indonesia)
Rohmah, Luqiyatur, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Padang State University (Indonesia)
Rosyiidah, Nur Anisa, Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Negeri Surabaya, Jl. Ketintang Wiyata, No. 62, Surabaya, 60231, East Java, Indonesia (Indonesia)
Roza, Destria, Chemistry Department Faculty of Mathematics and Natural Science, State University of Medan (Indonesia)

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