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3 years ago

5

Which is the first step in the dissolving process?

2 answers:

storchak [24]3 years ago

8 0

Answer:

The correct answer is option B, The solute molecules are carried into the solution

Explanation:

When a solute is added to a solvent it dissolves in it by occupying the space between the atoms/molecules of the solvent. This space between the atoms/molecules is called interstitial space. For example - when sugar(solute) is added to water (solvent), the atoms of sugar occupies the space between the molecules of water and thus the sugar dissolves without increasing the volume of the solution.

Margaret [11]3 years ago

4 0

The correct Answer Is : D

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La masa molecular de la cafeina es de 194,19g ¿cual es la formula molecular de la cafeina ?

Zina [86]

Answer:

the formula for the molecular caffeine is C8H10N4O2

Explanation:

percent to mass, mass to mole, divide by small multiply till whole

4 0

2 years ago

A certain gasol occupies a volume of 12.5 L at 50 degree Celsius and 740 torr. what would its volume be at STP? do the equation

Charra [1.4K]

n=PV/RT

convert:

740 torr to atm (1 atm=760 torr)

50 degree celsius to kelvin ( degree celsus +273= kelvin)

n=(0.9737 atm)(12.5L)÷(0.08206 L atm mol ⁻¹k⁻¹) (323 K)

n=0.4592 mols×22.4 L/1 mol. (22.4 L STP= 1 mol)

=10.286 L at STP

it could be this

4 0

3 years ago

Find the molar mass of potassium dichromate, K2Cr2O7

prisoha [69]

The molar mass of K is 39, Cr is 52, and O is 16. The rough calculation of these numbers are 294.

6 0

3 years ago

If a car travels 800m in 30 seconds how fast is it going? HELP MEEE!!

Paul [167]

Answer:

<h2>26.67 m/s</h2>

Explanation:

The speed of the car can be found by using the formula

$v = \frac{d}{t} \\$

d is the distance

t is the time taken

From the question we have

$v = \frac{800}{30} = \frac{80}{3} \\ = 26.66666...$

We have the final answer as

<h3>26.67 m/s</h3>

Hope this helps you

7 0

3 years ago

At 25∘C, the decomposition of dinitrogen pentoxide, N2O5(g), into NO2(g) and O2(g) follows first-order kinetics with k=3.4×10−5

Annette [7]

Answer:

4600s

Explanation:

$2N_{2}O_{5}(g) - - -> 4NO_{2}(g) +O_{2}$

For a first order reaction the rate of reaction just depends on the concentration of one specie [B] and it’s expressed as:

$-\frac{d[B]}{dt}=k[B] - - - -\frac{d[B]}{[B]}=k*dt$

If we have an ideal gas in an isothermal (T=constant) and isocoric (v=constant) process.

PV=nRT we can say that P = n so we can express the reaction order as a function of the Partial pressure of one component.

$-\frac{d[P(B)]}{P(B)}=k*dt$

$-\frac{d[P(N_{2}O_{5})]}{P(N_{2}O_{5})}=k*dt$

Integrating we get:

$\int\limits^p \,-\frac{d[P(N_{2}O_{5})]}{P(N_{2}O_{5})}=\int\limits^ t k*dt$

$-(ln[P(N_{2}O_{5})]-ln[P(N_{2}O_{5})_{o})])=k(t_{2}-t_{1})$

Clearing for t2:

$\frac{-(ln[P(N_{2}O_{5})]-ln[P(N_{2}O_{5})_{o})])}{k}+t_{1}=t_{2}$

$ln[P(N_{2}O_{5})]=ln(650)=6.4769$

$ln[P(N_{2}O_{5})_{o}]=ln(760)=6.6333$

$t_{2}=\frac{-(6.4769-6.6333)}{3.4*10^{-5}}+0= 4598.414s$

4 0

3 years ago