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4 years ago

What is 140.2 in scientific notation

Chemistry

2 answers:

Vilka [71]4 years ago

5 0

$1.402 \: \times \: {10}^{2}$

Akimi4 [234]4 years ago

4 0

Answer:

1.402 * 10^2.

Explanation:

There are 3 digits before the decimal point so the exponent is 2.

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Fe(s) + CuSO4(aq) <===> Cu(s) + FeSO4(aq)

Ludmilka [50]

Answer : The original concentration of copper (II) sulfate in the sample is, $5.6\times 10^{-1}g/L$

Explanation :

Molar mass of Cu = 63.5 g/mol

First we have to calculate the number of moles of Cu.

Number of moles of Cu = $\frac{\text{Mass of Cu}}{\text{Molar mass of Cu}}=\frac{89\times 10^{-3}g}{63.5g/mol}=1.40\times 10^{-3}mole$

Now we have to calculate the number of moles of $CuSO_4$

Number of moles of Cu = Number of moles of $CuSO_4$

Number of moles of $CuSO_4$ = $1.40\times 10^{-3}mole$

Now we have to calculate the molarity of $CuSO_4$

$\text{Molarity}=\frac{\text{Moles of }CuSO_4\times 1000}{\text{Volume of solution (in mL)}}$

Now put all the given values in this formula, we get:

$\text{Molarity}=\frac{1.40\times 10^{-3}mole\times 1000}{400.mL}=0.0035M$

To change mol/L into g/L, we need to multiply it with molar mass of $CuSO_4$

Molar mass of $CuSO_4$ = 159.609 g/mL

Concentration in g/L = $0.0035M\times 159.609g/mol=0.5586g/L\approx 5.6\times 10^{-1}g/L$

Thus, the original concentration of copper (II) sulfate in the sample is, $5.6\times 10^{-1}g/L$

3 0

3 years ago

Which contribute to both chemical and mechanical weathering? Check all that apply. abrasion freezing organisms oxidation water

Irina-Kira [14]

The answer is organisms, oxidation & water. Organisms such as plants have their roots penetrate the cracks in the rocks. As the roots grow and become bigger they put mechanical pressure on the rocks and the cracks increase in size and the rocks are split. Additionally, organisms secrete organic acids, as wastes, that chemically react with minerals in the rocks hence causing weathering.

Oxidation is a chemical reaction that changes the property of minerals by makes them prone to weathering. An example is the oxidation of iron in the rocks to iron III oxide which is brittle.

Water participates in chemical reaction by dissolving minerals, such as limestone (CaCO3) from the rock hence leaving the rock porous and more predisposed to physical weathering agents.

3 0

4 years ago

What is the charge of the nucleus of an atom

DochEvi [55]

Answer:

The nucleus contains protons, which have a positive charge

Explanation:

5 0

4 years ago

Describe how you created the 0.075 M glucose solution from the 1 M stock solution. Show your calculations and give details about

soldier1979 [14.2K]

Answer:

by addind

Explanation:idk how to do this

8 0

4 years ago

After mixing equal amounts of the two molecules, the solution achieved equilibrium at 25 ∘ C . 25 ∘C. The concentration at equil

lbvjy [14]

Answer:

Keq = 19

ΔG° = -7.3kJ/mol

Explanation:

Based on the chemical reaction:

Glucose 1-phosphate ⇄ Glucose 6-phosphate

The equilibrium constant, Keq is defined as:

Keq = [Glucose 6-phosphate] / [Glucose 1-phosphate]

Where [] are equilibrium concentrations of each substance

Replacing:

Keq = [0.19M] / [0.01M]

Keq = 19

Now, standard free energy change, ΔG° is defined as:

ΔG° = -RT ln K

Where R is gas constant 8.314J/molK

T is absolute temperature (25°C + 273.15K = 298.15K)

and K is equilibrium constant = 19

Replacing:

ΔG° = -8.314J/molK*298.15K ln 19

ΔG° = -7299J/mol

ΔG° = -7.3kJ/mol

6 0

3 years ago