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2 years ago

how does the percentage by mass of the solute describe the concentration of an aqueous solution os potassium sulfate

Chemistry

1 answer:

kirza4 [7]2 years ago

3 0

Answer:

Explanation:

In an aqueous solution of potassium sulfate (K₂SO₄), the solute is K₂SO₄ and the solvent is water. The percentage by mass describes the grams of solute there are dissolved per 100 grams of solution. It can be calculated as:

mass percentage = (mass of solute/total mass of solution) x 100%

For example, in an aqueous solution which is 2% by mass of K₂SO₄, there are 2 grams of K₂SO₄ per 100 g of solution.

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Significant Digits and Scientific Notation Part 1: Determine the number of significant digits in each number and write out the s

MA_775_DIABLO [31]

Answer:

1. 6 significant digits. 2. 2 significant digits. 3. 8 significant digits. 4. 4 significant digits. 5. 8 significant digits. 6. 7 significant digits. 7. 2 significant digits.

Explanation:

All nonzero digits are significant. All zeros before nonzeros are insignificant. All zeros after nonzeros are insignificant unless they are made for precision of some data. So 405000 may have 3 or 6 significant figures. But usually all zero figures after significant digits are significant.

8 0

3 years ago

When the equation __H2O2 --> __H2O + __O2 Is completely balanced, the sum of all the coefficients will be A) 5 B) 8 C) 3 D) 4

kkurt [141]

Answer:

A)5

Explanation:

2H2O2 --> 2H2O + 1O2

2+2+1=5

sum=5

8 0

3 years ago

Which of the following describes the motion of water molecules in ice?

LekaFEV [45]

Answer:

the answer is c they move faster then a solid

3 0

3 years ago

PLEASE HELP ME ASAP DUE TODAY!!!!!!!!!!!!

Serggg [28]

Answer:

1.23 g/mL

-18.2%

Explanation:

We need to find the average, which is just the sum of the numbers divided by the number of numbers. Here, the sum will be 1.24 + 1.21 + 1.23 = 3.68 g/mL. There are 3 numbers, so divide 3.68 by 3: 3.68 / 3 ≈ 1.2266...

However, we need to round this and take into account significant figures. Each trial gave a number with 3 significant figures, so we round our number off to three: 1.22666... ≈ 1.23. So, circle the first number under the X column.

We now need to find the percent error, which is RE (%). To calculate this, we take the measured value (1.23 in this case) and subtract the exact value (1.50 here) from it, and then divide that by the exact value:

(1.23 - 1.50) / 1.50 ≈ -0.1822...

Again, we need to round to 3 significant figures, which would make it:

-0.1822... ≈ -0.182

Thus, circle the last number under the RE (%) column.

4 0

3 years ago

Vhich of the following equations is correctly balanced?

Eva8 [605]

Answer:

option 3.

2Cr(NO₃)₃ + 3 FeSO₄ → 3 Fe(NO₃)₂ + Cr₂(SO₄)₃

Explanation:

Balance Chemical Equation:

A balanced chemical equation is that in which the number of the reactant atoms equal to the number of the product atom.

For example if the oxygen at the reactant side is 4, the number of oxygen must be 4 on the product side.

Solution

Check each equation one by one

1. Cr(NO₃)₃ + 2 FeSO₄ → 2 Fe(NO₃)₂ + Cr₂(SO₄)₃

Number of atoms of Reactant:

Cr = 1

N = 3

O = 17

Fe = 2

S = 2

Number of atoms of Reactant:

Cr = 2

N = 4

O = 24

Fe = 2

S = 3

So this is not a balance equation as the atoms of the reactant atom not equal to the product atoms.

___________________________________

2. 2Cr(NO₃)₃ + 2 FeSO₄ → 2 Fe(NO₃)₂ + Cr₂(SO₄)₃

Number of atoms of Reactant:

Cr = 2

N = 6

O = 26

Fe = 2

S = 2

Number of atoms of Reactant:

Cr = 2

N = 4

O = 24

Fe = 2

S = 3

So this is not a balance equation as the atoms of the reactant atom not equal to the product atoms.

___________________________________

2Cr(NO₃)₃ + 3 FeSO₄ → 3 Fe(NO₃)₂ + Cr₂(SO₄)₃

Number of atoms of Reactant:

Cr = 2

N = 6

O = 30

Fe = 3

S = 3

Number of atoms of Reactant:

Cr = 2

N = 6

O = 30

Fe = 3

S = 3

So this is a balance equation as the atoms of the reactant atom are equal to the product atoms.

Note** you write Cu and Cl instead of Cr, So that was also corrected.

5 0

4 years ago