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4 years ago

Which ionic equation is balanced?

1 answer:

6 0

For an equation to be balanced, the number of atoms of the reactants and products have to be equal. Therefore, (3) 3Fe3++ Al → 3Fe2++ Al3+ is the balanced equation, as you have 3 Fe atoms and 1 Al atom on both sides. The exponents are just the charges of the elements, and you don't need to care about these numbers in order to balance a chemical equation.
Hope this would help :))

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What is 8.3 x 10^4 in standard form

Ratling [72]

Answer:

83.000

Step-by-step explanation:

8.3 × 10⁴

= 8.3 × (10 × 10 × 10 × 10)

= 8.3 × (100 × 10 × 10)

= 8.3 × (100 × 100)

= 8.3 × 10.000

= 83.000

Conclusion:

The result of 8.3 × 10⁴ is 83.000

7 0

3 years ago

Read 2 more answers

Why is DNA called a double helix?

kirill [66]

Answer:

the double helix of dna is, like its name, implies, in the shape of a helix which is essentially a three-dimensional spiral. the double comes from the fact that the helix is made of two long strands of dna that are intertwined—sort of like a twisted ladder.

Explanation:

hope this helps :)

have a nice day !!

7 0

3 years ago

Determine the empirical formula of a compound having the following percent composition by mass: K: 24.74%; Mn: 34.76%; O: 40.50%

Dovator [93]

Answer: The empirical formula of the compound is $KMnO_4$

Explanation:

The empirical formula is the chemical formula of the simplest ratio of the number of atoms of each element present in a compound.

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ......(1)

Let the mass of the compound be 100 g

Given values:

% of K = 24.7%

% of Mn = 34.76%

% of O = 40.50%

Mass of K = 24.7 g

Mass of Mn = 34.76 g

Mass of O = 40.50 g

To calculate the empirical formula of a compound, few steps need to be followed:

Step 1: Calculating the number of moles of each element

We know:

Molar mass of K = 39.10 g/mol

Molar mass of Mn = 54.94 g/mol

Molar mass of O = 16 g/mol

Putting values in equation 1, we get:

$\text{Moles of K}=\frac{24.7g}{39.10g/mol}=0.632 mol$

$\text{Moles of Mn}=\frac{34.76g}{54.94g/mol}=0.633 mol$

$\text{Moles of O}=\frac{40.50g}{16g/mol}=2.53 mol$

Step 2: Calculating the mole fraction of each element by dividing the calculated moles by the least calculated number of moles that is 0.632 moles

$\text{Mole fraction of K}=\frac{0.632}{0.632}=1$

$\text{Mole fraction of Mn}=\frac{0.633}{0.632}=1$

$\text{Mole fraction of O}=\frac{2.53}{0.632}=4$

Step 3: Writing the mole fraction as the subscripts of each of the element

The empirical formula of the compound becomes $K_1Mn_1O_4=KMnO_4$

Hence, the empirical formula of the compound is $KMnO_4$

4 0

3 years ago

What type of chemical reaction is:

Valentin [98]

Answer:

Synthesis

Explanation:

That's the answer to that question

6 0

3 years ago

Read 2 more answers

What are liters, millimeters, and cubic centimeters used to measure

Lapatulllka [165]

They are all units of volume as are, Cubic Metres, Cubic Inches and Cubic Feet. 1mL and 1 cubic centimetre (cc) are the same. Any one of the above is used to indicate the Density of substances which are compared to the density of pure water. By multiplying the Density of water by the Specific Gravity of the substance (Liquid or Solid), its density and, by calculation, it mass can be found. (cc and cmÂł are used for the solid materials. (a mL or Litre of copper or other solid doesn't quite sound right as they are used for liquid volume.

8 0

4 years ago