3 years ago

PLEASE

Chemistry

1 answer:

Anna11 [10]3 years ago

6 0

Answer:

CANNOT BE CREATED MOVES IN WAVES

Explanation:

You might be interested in

How many moles are in 454 Liters of a gas?

Natalka [10]

Answer:

20.27 mol

Explanation:

454 L x (1 mol/22.4 L) = 20.27 mol

3 0

3 years ago

A certain substance X has a normal freezing point of -10.1 degree C and a molal freezing point depression constant Kf = 5.32 °C.

Citrus2011 [14]

Answer : The freezing point of a solution is $-15.4^oC$

Explanation : Given,

Molal-freezing-point-depression constant $(K_f)$ = $5.32^oC/m$

Mass of urea (solute) = 29.82 g

Mass of solvent = 500 g = 0.500 kg

Molar mass of urea = 60.06 g/mole

Formula used :

$\Delta T_f=i\times K_f\times m\\\\T^o-T_s=i\times K_f\times\frac{\text{Mass of urea}}{\text{Molar mass of urea}\times \text{Mass of solvent in Kg}}$

where,

$\Delta T_f$ = change in freezing point

$\Delta T_s$ = freezing point of solution = ?

$\Delta T^o$ = freezing point of solvent = $-10.1^oC$

i = Van't Hoff factor = 1 (for urea non-electrolyte)

$K_f$ = freezing point constant = $5.32^oC/m$

m = molality

Now put all the given values in this formula, we get

$-10.1^oC-T_s=1\times (5.32^oC/m)\times \frac{29.82g}{60.06g/mol\times 0.500kg}$

$T_s=-15.4^oC$

Therefore, the freezing point of a solution is $-15.4^oC$

5 0

3 years ago

please help i have 58 of these due tmr. if you know of an answer key or know the answers please comment.

Alekssandra [29.7K]

11.

c, because the object is not in direct contact to anything with gravity

5 0

3 years ago

At Stp, which physical property of aluminum always remains the same from sample to sample?

Elenna [48]

Density- The proportion of mass to volume of an object.

<span>Density determines what floats and what sinks. More dense sinks less dense will float.</span>

7 0

4 years ago

Read 2 more answers

What would the unit of measurement be for the density of a regular solid?

balu736 [363]

Answer:

SI unit: kg/m³

but g/cm³ is commonly used

Explanation:

7 0

3 years ago