Question

Pls Help ASAP! 2 grams of potassium (K) reacts with 5 grams of Oxygen (O). According to the Law of Conservation of Mass, how many grams of potassium oxide (K2O) will be produced?

O 10 grams

O 7 grams

O 2 grams

O 5 grams

Answer 1

According to the Law of Conservation of Mass, the total mass of the reactants must be equal to the total mass of the products in a chemical reaction. In this case, 2 grams of potassium reacts with 5 grams of oxygen. From the balanced equation, 4 moles of potassium react with 1 mole of oxygen to produce 2 moles of potassium oxide. Therefore, the mass of potassium oxide produced is 44.08 grams.

Step-by-step explanation:

According to the Law of Conservation of Mass, the total mass of the reactants must be equal to the total mass of the products in a chemical reaction.

In this case, 2 grams of potassium reacts with 5 grams of oxygen. To find the mass of potassium oxide produced, we need to balance the equation:

4K (s) + O₂(g) → 2K₂O(s)

From the balanced equation, we can see that 4 moles of potassium react with 1 mole of oxygen to produce 2 moles of potassium oxide. Therefore, the molar mass of potassium oxide is calculated as (2 moles of potassium x 39.10 g/mol) + (1 mole of oxygen x 32.00 g/mol) = 110.20 g/mol.

Now, we can determine the mass of potassium oxide produced by setting up a proportion:

(2 grams of potassium oxide) / (110.20 g/mol) = (x grams of potassium oxide) / (5 grams of oxygen)

Solving for x gives us x = 2*110.20/5 = 44.08 grams of potassium oxide.

Answer 2

(Question) What does the Law of Conservation of Mass state?

(Answer) The total mass of all of the reactants prior to a chemical reaction must equal the total mass of all the products after the reaction.

(Question) If the mass of elements before a chemical reaction is 30 grams, after the chemical reaction, the mass will be __.

(Answer) 30 grams

(Question) 78 g of potassium (K) react with 71 g of chlorine (Cl) to produce potassium chloride. According to the Law of Conservation of Mass, what is the mass of the product (2KCl)?

(Answer) 149 g

(Question) 2 grams of potassium (K) reacts with 5 grams of Oxygen (O). According to the Law of Conservation of Mass, how many grams of potassium oxide (K2O) will be produced?

(Answer) 7

(Question) Which of the following equations demonstrates the Law of Conservation of Mass?

(Answer) CH4+O2→C+2H2O

Step-by-step explanation:

just finished the quick check. hope this helps UwU