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ryzh [129]
2 years ago
12

Determine the frequency of light with a wavelength of 2.672 x 10^-7cm

Chemistry
1 answer:
yaroslaw [1]2 years ago
8 0

Answer:

Determine the frequency of light with a wavelength of 2.775⋅10−7 cm. Answer in units of Hz?❤

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When 74.8g of alanine C3H7NO2 are dissolved in 1450.g of a certain mystery liquid X, the freezing point of the solution is 8.30°
dlinn [17]

Answer: The mass of potassium bromide that must be dissolved in the same mass of X to produce the same depression in freezing point is 58.2 grams

Explanation:

Depression in freezing point is given by:

\Delta T_f=i\times K_f\times m

\Delta T_f=T_f^0-T_f=8.30^0C = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte)

K_f = freezing point constant =  

m= molality = \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}=\frac{74.8g\times 1000}{1450g\times 89.09g/mol}=0.579

8.30^0C=1\times K_f\times 0.579

K_f=14.3^0C/m

Let Mass of solute (KBr) = x g

8.3^0C=1.72\times 14.3\times \frac{xg\times 1000}{119g/mol\times 1450g}

x=58.2g

Thus the mass of potassium bromide that must be dissolved in the same mass of X to produce the same depression in freezing point is 58.2 grams

7 0
2 years ago
How far will you run in 3 minutes if you run at a pace of 4 meters per second?
atroni [7]

Answer:

you will run 720 meters

Explanation:

because 4 times 60 is 240 and 240 times 3 is 720

7 0
3 years ago
If mixture didn't exist how would life be different​
ollegr [7]

Answer:

boring

Explanation:

life would be meaningless like everyone being like on person

8 0
3 years ago
1 mole of Cl2 will produce how many atoms of KCl?
olchik [2.2K]

Answer:

1.1 mole

Explanation:

The mass of potassium chloride is 3.8 g . Look at the mole ratio you have between potassium chlorate and potassium chloride; what you will see is that every 2 moles of potassium chlorate will produce 2 moles of potassium chloride, i.e. you have a 1:1 mole ratio between the two compounds

6 0
2 years ago
The amount of matter is an object is known as _____.
Licemer1 [7]

Density is the mass of a substance per unit volume. Volume is the amount of space an object occupies.

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3 years ago
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