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2 years ago

A ball was massed in a dish. The total mass was 15.6 grams. Treball was placed in a

Chemistry

1 answer:

iVinArrow [24]2 years ago

3 0

Answer:

14.57g

Explanation:

Given parameters:

Mass of dish + ball = 15.6g

Initial volume of water in the cylinder = 26.7mL

Final volume of water in the cylinder = 38.9mL

Mass of dish = ?

Unknown

Mass of the ball = ?

Solution;

Since the mass of ball and dish is 15.6g,

Mass of the ball =Mass of ball + dish - mass of the dish

Insert the parameters and solve;

Mass of the ball = 15.6g - 1.03g = 14.57g

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Answer:

The correct option is;

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Explanation:

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Hence explicit knowledge and tacit knowledge are complementary

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3 years ago

The concentration of copper(II) sulfate in one brand of soluble plant fertilizer is 0.070% by weight. If a 21.5 g sample of this

Semmy [17]

Answer:

The molar concentration of $Cu^{2+}$ ions in the given amount of sample is $4.73\times 10^{-5}M$

Explanation:

Given that,

Mass of sample = 21.5 g

0.07 % (m/m) of copper (II) sulfate in plant fertilizer

This means that, in 100 g of plant fertilizer, 0.07 g of copper (II) sulfate is present

So, in 20 g of plant fertilizer

, $=\frac{0.07}{100}\times 21.5}\\=0.0151g$ of copper (II) sulfate is present.

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution (in L)}}$

Mass of solute (copper (II) sulfate) = 0.0151 g

Molar mass of copper (II) sulfate = 159.6 g/mol

Volume of solution = 2.0 L

$\text{Molarity of solution}=\frac{0.0151g}{159.6g/mol\times 2.0L}\\\\\text{Molarity of solution}=4.73\times 10^{-5}M$

The chemical equation for the ionization of copper (II) sulfate follows:

$CuSO_4\rightarrow Cu^{2+}+SO_4^{2-}$

1 mole of copper (II) sulfate produces 1 mole of copper (II) ions and sulfate ions

Molarity of copper (II) ions = $4.73\times 10^{-5}M$

Hence, the molar concentration of $Cu^{2+}$ ions in the given amount of sample is $4.73\times 10^{-5}M$

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3 years ago

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2 years ago

The discovery of protons and electrons most directly refuted or replace the idea that

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The discovery of the electron in 1897 by J. J Thomson and the proton in 1917 by Rutherford most directly refuted or replace the idea that the atom resembles plum pudding.

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