What mass of carb dioxide must have been formed

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Question- Sample of rubidium carbonate weighing 7.0 g required 2.0 g hydrogen chloride gas to decompose in water, rub chl, and carb dioxide gas. Total mass of water and rub chloride formed is 7.9 g and no hydrogen chloride or rub carb remains. According to the law of cons of mass, what mass of carb dioxide must have been formed?

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