Answer:
D. 15g
Explanation:
The law of conservation of mass states that, in a chemical reaction, mass can neither be created nor destroyed. This means that the amount of matter in the elements of the reactants must be equal to the amount in the resulting products.
In this question, 25 grams of a reactant AB, was broken down in a reaction to produce 10 grams of products A and X grams of product B. According to the law of conservation of mass, the mass of the reactant must be equal to the total mass of the products. This means that 25 grams must also be the total mass of both products in this reaction. Hence, if product A is 10 grams, product B will be 25 grams - 10 grams = 15 grams.
Therefore, product B must be 15 grams in order to form a total of 25 grams when added to the mass of product A. This will equate the mass of the reactant AB and fulfill the law of conservation of mass.
Answer:
2.00 J/g.°C
Explanation:
To solve this problem, we can use the relation:
Q = mcΔT,
Where, Q is the amount of heat needed to raise the temperature of the substance (J).
m is the mass of the substance (g).
c is the specific heat capacity of the substance (J/g.°C).
ΔT is the temperature difference (ΔT = final T - initial T).
As clear from the relation; ΔT = Q / mc,
∵ ΔT ∝ 1/c,
The temperature difference is inversely proportional to the specific heat of the substance.
∴ The substance that will have least increase in temperature will be that has the highest specific heat capacity (2.00 J/g.°C).
Answer:
2Ag(s) + 2HNO₃ (aq) → 2AgNO₃(aq) + H₂(g)
Explanation:
Metallic silver = Ag (s)
Concentrated nitric acid = HNO₃ (aq)
Product being hydrogen gas = H₂(g)
2Ag(s) + 2HNO₃ (aq) → 2AgNO₃(aq) + H₂(g)
Be careful AgNO₃ doesn't precipitate
Answer : The temperature (Celsius) if they each shrink to a volume of 2.0 liters is,
Explanation :
Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.
The combined gas equation is,
where,
= initial pressure of gas = 1.00 atm
= final pressure of gas = 0.77 atm
= initial volume of gas = 2.5 L
= final volume of gas = 2.0 L
= initial temperature of gas =
= final temperature of gas = ?
Now put all the given values in the above equation, we get:
Therefore, the temperature (Celsius) if they each shrink to a volume of 2.0 liters is,