Chemistry
Grade-8
Easy
Question
The following picture depicts the:
- Law of reciprocal proportion
- Graham’s Law
- Law of conservation of mass
- Avogadro’s law
Hint:
Mass of reactants= mass of products.
The correct answer is: Law of conservation of mass
- The law of conservation of mass states that the mass of an isolated system is neither created nor destroyed, but can be transformed from one form to another.
- According to the law of conservation of mass, in a low-energy thermodynamic process, the mass of the reactants must equal the mass of the products.
- The mass of reactants is equal to the mass of products.
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While verifying the law of conversation of mass, Ron added 4.5 g of magnesium metal to 15.5 g of hydrochloric acid. If mass of the magnesium chloride formed is 16.9, what is the mass of eliminated hydrogen gas if the law of conservation of mass is valid for this change.
Mg + 2HCl → MgCl2 + H2↑
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Mg + 2HCl → MgCl2 + H2↑
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