Answer:
d , before the molten rock becomes lava, it is first magma, and most people know that lava is ejected from volcanoes
Given the mass of aluminum sulfide
= 21.0 g
Molar mass of = 
Calculating the moles of :
Each mole has 3 mol S.
Each mole S constitutes 
Calculating atoms of S in 0.14 mol :
= 
This is false because it doesn't matter about the mass
Answer:
Endothermic reaction chemical equation
Reactnt A + Reactant B + Heat (energy) ⇒ Products
Exothermic reaction chemical equation
Reactnt A + Reactant B ⇒ Products + Heat (energy)
Explanation:
Endothermic Reaction
An endothermic reaction is a reaction that reaction that requires heat before it would take place resulting in the absorption of heat from the surrounding that can be sensed by the coolness of the reacting system
An example of an endothermic reaction is a chemical cold pack that becomes cold when the chemical and water inside it reacts
Exothermic Reaction
An exothermic reaction is one that rekeases energy to the surroundings when it takes place. This is as a result of the fact that the combined heat energy of the reactants is more than the chemical heat energy of the products. An example of an exothermic reaction is a burning candle
