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sleet_krkn [62]
3 years ago
10

Liquids and solids are left out of the equilibrium constant expression because their concentrations remain constant during react

ions. What is the molarity concentration of liquid water at 25.0 LaTeX: ^\circ ∘C given that its density is 0.997 g/mL at that temperature?
a.23.5 M
b.0.997 M
c.0.180 M
d.0.156 M
e.55.3 M
Chemistry
1 answer:
Anuta_ua [19.1K]3 years ago
8 0

Answer:

55.3 M

Explanation:

Given temperature = 25°C

Density = 0.997 g/mL

Based on density the mass of water per L = 997 grams

The molar mass of water = 18

The moles of water = \frac{mass}{molarmass}=\frac{997}{18}=55.3

The molarity is defined as the moles of water per litre.

The moles = 55.3

Volume = 1 L

So molarity = 55.3 /1 = 55.3 M

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Answer:

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Explanation:

From the question given above, the following data were obtained:

Electrical power (P) = 150 W

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Recall:

V = IR

Divide both side by R

I = V/R

P = V/R × V

P = V² / R

Where:

P => Electrical power

V => Voltage

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With the above formula (i.e P = V²/R), we can calculate resistance as illustrated below:

Electrical power (P) = 150 W

Voltage (V) = 24 V

Resistance (R) =?

P = V²/R

150 = 24² / R

150 = 576 / R

Cross multiply

150 × R = 576

Divide both side by 150

R = 576 / 150

R = 3.84 Ω

Thus, the resistance is 3.84 Ω

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2 years ago
The element Oxygen, O, is an example of which of the following?
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Explanation:

Given data:

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Solution:

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It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

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