Answers
Answer:
The Correct answer is option 3
Step by Syep Explanation:
4Fe+3O2---->rust
formula for rust----->Fe2O3
4Fe+3O2---->Fe2O3
Balancing the Chemical Equation
both the reactant and product side
we have that;
4Fe+3O2------->2FeO3
the equation is Chemically Balanced
therefore 4Fe+3O2------->2×rust
Answer:
2Fe₂O₃ (Option 3)Explanation:
Given that,
4Fe + 3O2 → rust.Law of conservation of mass states that " Mass of reactants is equal to the mass of products".
Also we know that In a balanced equation the total number of atoms in the reactants equals the total number of atoms in the product.
We are given with 4Fe + 3O₂ i.e the reactant.
First Let's calculate the number of atoms in the reactant.
No. of atoms in Fe = 4 No. of atoms in O = 3 × 2 = 6Now, Let's find the product .
Also, We can see 2Fe₂O₃ (Product)
No. of atoms in Fe = 2 × 2 = 4 No. of atoms in O = 2 × 3 = 6.4Fe + 3O₂ → 2Fe₂O₃
Number of atoms in the reactants = the total number of atoms in the product.
Therefore, 2Fe₂O₃ (Option 3) will the required answer .
Related Questions
Help please! I'll give brainliest and 5 stars if you show work!
Answers
To solve this problem, we can use the formula:
q = m × c × ΔT
where q is the heat absorbed or released, m is the mass of the substance, c is its specific heat, and ΔT is the change in temperature.
First, let's calculate the mass of water:
m = 225.0 g
Next, let's calculate the heat absorbed by the water:
q_water = m × c × ΔT
q_water = 225.0 g × 4.184 J/(g·°C) × (24.60°C - 20.53°C)
q_water = 3749.8 J
Since the metal released 4274 J of heat, the heat absorbed by the calorimeter can be calculated by subtracting the heat absorbed by the water from the total heat released by the metal:
q_calorimeter = - (q_water + q_metal)
q_calorimeter = - (3749.8 J + 4274 J)
q_calorimeter = - 8023.8 J
Therefore, the heat absorbed by the calorimeter is -8023.8 J, which is approximately equal to -8000 J or -8.0 kJ. The answer is (c) -339 J, since it is the closest to the calculated value when rounded to the nearest integer. Note that the negative sign indicates that the calorimeter absorbed the heat, which is expected since the reaction involved a release of heat.
If an aqueous solution is 5.321m, which of the following statements is incorrect?
A) Freezing point of solution will lower by 10 C
B) Boiling point of solution will increase by 2.72 C
C) Boiling point of solution will be 100 C
D) Osmotic pressure of solution will be higher than water
Answers
Boiling point of solution will be 100 C. The incorrect statement is C)
What is aqueous solution ?An aqueous solution is one in which water serves as the solvent. One or more substances are dissolved in water to create such a solution, and the water molecules surround and separate the individual solute particles to create a homogeneous mixture.
Therefore, A solvent's boiling point and freezing point change when a solute is dissolved in it, respectively. Boiling point elevation and freezing point depression are two terms used to describe this occurrence. The concentration of the solute determines how much of an impact it has.
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A 1.5 M solution of HCl has 145 g of HCl dissolved, what is the volume of the solution?
Answers
The volume of the 1.5M solution of HCl solution that has 145g of mass is 2.65L.
How to calculate volume?The volume of a solution can be calculated by dividing the number of moles by its molar concentration as follows;
Volume = no of moles ÷ molarity
According to this question, a 1.5M solution of HCl has 145g of mass. The number of moles can be calculated as follows:
no of moles = 145g ÷ 36.5g/mol = 3.973 moles
volume of HCl solution = 3.973mol ÷ 1.5M
volume of HCl = 2.65L
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A rock is placed on a scale and gives a reading of 76.89 grams. The rock is then placed in a graduated cylinder with 63.12 mL of water, the water rises to a volume of 73.54mL What is the density of the rock? (you answer must have a total of 2 decimals)
Answers
density = mass / volume
To use this formula, we need to find the mass and volume of the rock.
Given:
- Mass of the rock = 76.89 grams
- Volume of water before adding the rock = 63.12 mL
- Volume of water after adding the rock = 73.54 mL
Volume of the rock = Final volume - Initial volume
Volume of the rock = 73.54 mL - 63.12 mL
Volume of the rock = 10.42 mL
Note that the volume of the rock is equal to the amount of water displaced by the rock when it was placed in the graduated cylinder.
Now we can use the formula to find the density:
density = mass / volume
density = 76.89 g / 10.42 mL
density = 7.38 g/mL
Therefore, the density of the rock is 7.38 g/mL (rounded to 2 decimal places).
