24 g of magnesium were burned in oxygen. the compound formed had a mass of 40 g. explain why the mass had gone up.

Answer :

According to the law of conservation of mass, the mass of reactants must be equal to the mass of products.

The balanced chemical reaction is,

As we know that the molar mass of magnesium is 24 g/mole, the molar mass of is 32 g/mole and the molar mass of magnesium oxide is 40 g/mole.

From the given balanced reaction, we conclude that

As, 1 mole of magnesium react mole of oxygen to give 1 mole of magnesium oxide.

So, the mass of Mg is 24 g, the mass of and the mass of MgO is 40 g.

That means 24 g of Mg react with 16 g to give 40 g of MgO.

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.