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Chemistry, 22.02.2020 08:59 vpoon6739

Please help, I'm taking my final exam its do soon!!
Which of the following illustrates the conservation of matter?
A. SnO2 + H2 --> Sn + 2 H2O
B. 2 C + O2 --> CO2
C. KOH + HBr --> KBr + H2O
D. 6 Cs + N2 --> 6 Cs3N

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