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2 years ago

14

The waves energy runs through water molecules, but they do not move the water molecules in the direction of the waves. Lesson 2.

13 Question 24 options: True False

2 answers:

denis23 [38]2 years ago

7 0

The answer is true i agree with them

Nataly_w [17]2 years ago

6 0

I would say that the answer is True

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How many moles of neon gas are there 25.0 L of gas or 5.0°C with a pressure of 89.9 KPa?

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Volume=25L
Temperature=5°C
Pressure=89.9kPa

Now

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3 years ago

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How many valence electrons does oxygen have

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3 years ago

what is the minimum mass of ethylene glycol that must be dissolved in 14.5 kg of water to prevent the solution from freexing at

lbvjy [14]

Answer:

The minimum mass of ethylene glycol = 6.641 Kg

Explanation:

$\Delta T_f= T_f-T_f'\\T_f'=T_f-\Delta T_f$

Where T_f = freezing point of pure solvent water, 0°C

T_f'= Freezing point of solvent after mixture

K_f = Freezing point depression constant = 1.86 °C/m

Moecular weight of ethylene glycol = 60 g/mol

Weight of ethylene glycol = 14.5 Kg= 14.5×10^3 g

molality of ethylene glycol

$m = \frac{weight}{mol.wt} \times\frac{1000}{V}$

Substitute the values to calculate m

$m = \frac{w}{60} \times\frac{1000}{14.5\times1000}$

by formula

$0-(-14.2) =1.86\frac{w}{60} \times\frac{1000}{14.5\times1000}$

calculating we get w = 6641.93 g

Therefore, The minimum mass of ethylene glycol = 6.641 Kg

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3 years ago