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Which two of the choices below MUST be applied in order to work with the law of conservation of mass? (Select two.)(2 points) Responses The equation has to be balanced. The equation has to be balanced. The experimenter should change subscripts until the equation is balanced. The experimenter should change subscripts until the equation is balanced. All compounds must have a coefficient greater than 1 in front of them before conservation can be supported. All compounds must have a coefficient greater than 1 in front of them before conservation can be supported. The masses must be in a closed system.

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In order to work with the law of conservation of mass, the two choices that MUST be applied are:

  1. The equation has to be balanced.
  2. The masses must be in a closed system.

These choices ensure that mass is conserved in a chemical reaction, which is a key principle of the law of conservation of mass. The equation must be balanced to reflect that the same number of each type of atom exists before and after the reaction, and a closed system ensures that no mass is lost or gained from external sources.