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3 years ago

Hydrangea plant's petals change to which colour on the addition of acids?

1 answer:

4 0

If it's a pH below six it's blue, if it's a pH between 6 and 7 then it would be purple, if it's above 7 it would be pink or red

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Determine the molality of ions in a solution formed by dissolving 0.187 moles of NaCl in 456 grams of water. The density of the

PSYCHO15rus [73]

Answer:

Molality Ions Na⁺ = 0.410 m

Molality Ions Cl⁻ = 0.410 m

Total ion molality = 0.820 m

Explanation:

Molality (m) is defined as moles of solute that are dissolved in 1000g (1kg) of solvent. In this case, the molality of the ions is requested, so it should be borne in mind that when the NaCl salt dissolves in the water, it dissociates forming ions as follows:

NaCl ⇒Na⁺ (aq) + Cl⁻ (aq)

Therefore, for each mole of salt that dissolves, you will have 1 mole of Na⁺ and 1 mole of Cl⁻

Knowing the amount of initial solute moles and the mass of water, we proceed to perform the calculations for each ion:

Ions Na⁺

456 g of H₂O ____ 0.187 mol Na⁺

1000 g of H₂O ____ X = 0.410 m

Calculation: 1000 g x 0.187 mol / 456 g = 0.410 mol

Ions Cl⁻

456 g of H₂O ____ 0.187 mol Cl⁻

1000 g of H₂O ____ X = 0.410 m

Calculation: 1000 g x 0.187 mol / 456 g = 0.410 m

If both results are added, the total molality of the ions will be obeyed:

0.410 m + 0.410 m = 0.820 m

This means that for every kilogram of water, 0.820 moles of dissociated ions from NaCl are dissolved.

8 0

2 years ago

Which term is same for one mole of oxygen gas and one mole of water

miv72 [106K]

The number of atoms in one mole is same in both which is 6 x 10^23 ^23 means power 23

6 0

3 years ago

Explain what is cellular growth and repair? Why is it important?

HACTEHA [7]

Answer:

Cell growth usually refers to cell proliferation, the increase in cell numbers that occurs through repeated cell division. Cell growth can also refer to the enlargement of cell volume, which can take place in the absence of cell division. As living things grow, some cells die or become damaged and need replacements. Some single-celled organisms use a type of mitosis as their only form of reproduction. In multicellular organisms, cell division allows individuals to grow and change by expanding the number of total cells.

Hope this helps!!!

3 0

2 years ago

How many grams of sulfur are required in the preparation of 35.7 moles of sulfur dioxide Sg + O2 SO2

lidiya [134]

S+O_2-->SO_2

Its balanced already

1 mol SO_2 require 1 mole sulphur
35.7moles require 35.7mol sulphur

Mass of S

35.7(32)
1142.4g

6 0

2 years ago

Electroplating is a way to coat a complex metal object with a very thin (and hence inexpensive) layer of a precious metal, such

8_murik_8 [283]

Answer:

0.0164 g

Explanation:

Let's consider the reduction of silver (I) to silver that occurs in the cathode during the electroplating.

Ag⁺(aq) + 1 e⁻ → Ag(s)

We can establish the following relations.

1 A = 1 C/s
The charge of 1 mole of electrons is 96,468 C (Faraday's constant)
1 mole of Ag(s) is deposited when 1 mole of electrons circulate.
The molar mass of silver is 107.87 g/mol

The mass of silver deposited when a current of 0.770 A circulates during 19.0 seconds is:

$19.0s \times \frac{0.770c}{s} \times \frac{1mole^{-} }{96,468C} \times \frac{1molAg}{1mole^{-}} \times \frac{107.87g}{1molAg} = 0.0164 g$

5 0

2 years ago