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4 years ago

How are diffusion and osmosis different?

Chemistry

1 answer:

elena55 [62]4 years ago

8 0

Osmosis is about the movement of water molecules and diffusion is about the movement of substances

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Aspirin is well known as a pain reliever (analgesic) and as a fever reducer (antipyretic). It has a molar mass of 180.2 g/mol an

denis23 [38]

Answer: The molecular formula of aspirin is $C_8H_8O_2$

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of C= 60.0 g

Mass of H = 4.5 g

Mass of O = 35.5 g

Step 1 : convert given masses into moles.

Moles of C = $\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{60.0g}{12g/mole}=5.00moles$

Moles of H = $\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{4.5g}{1g/mole}=4.5moles$

Moles of O = $\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{35.5g}{16g/mole}=2.22moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C = $\frac{5.00}{2.22}=2$

For H = $\frac{4.5}{2.22}=2$

For O = $\frac{2.22}{2.22}=1$

The ratio of C : H: O= 2: 2: 1

Hence the empirical formula is $C_2H_2O$

The empirical weight of $C_2H_2O$ = 2(12)+2(1)+1(16)= 42g.

The molecular weight = 180.2 g/mole

Now we have to calculate the molecular formula.

$n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{180.2}{42}=4$

The molecular formula will be= $4\times C_2H_2O=C_8H_8O_2$

7 0

4 years ago

Read 2 more answers

Find the number of moles of phosphorus in 825 g of phosphorous.

ArbitrLikvidat [17]

Answer:

Explanation:

remember that the phosphorous formula is P4

n P4 = mass / M.wt

825 / 4x 30.97 =

= 6.660 mole

4 0

3 years ago

Sort the functions of life based on whether they are performed by an amoeba or a plant.makes food fromcarbon dioxide,water, and

jeka94

Explanation:

Plants are autotrophic organisms which prepare their food with the help of photosynthesis. Plants can have both asexual or multi-sexual reproduction.

Amoeba is a single celled eukaryotic organism. It moves through pseudopodia and it does not have any definite shape. Amoeba can have only asexual reproduction.

The given functions for amoeba and plants are sorted as follows.

Functions of Amoeba:

has only offspring with identical genes and traits.
surrounds and engulfs food particles.
move freely in their environment.

Functions of Plants:

makes food from carbon dioxide,water, and sunlight.
can have offspring with different genes and traits.

3 0

4 years ago

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Initial Concentration mol/L[A] Initial Concentration mol/L[B] Initial Rate mol/Ls 0.20 0.10 20 0.20 0.20 40 0.40 0.20 160 Given

zimovet [89]

The generalized rate expression may be written as:
r = k[A]ᵃ[B]ᵇ

We may determine the order with respect to B by observing the change in rate when the concentration of B is changed. This can be done by comparing the first two runs of the experiment, where the concentration of A is constant but the concentration of B is doubled. Upon doubling the concentration of B, we see that the rate also doubles. Therefore, the order with respect to concentration of B is 1.
The same can be done to determine the concentration with respect to A. The rate increases 4 times between the second and third trial in which the concentration of B is constant, but that of A is doubled. We find that the order with respect to is 2. The rate expression is:

r = k[A]²[B]

4 0

3 years ago

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How many molecules of oxygen can be made from 9.52g of nickel (III) oxide?

snow_tiger [21]

Answer:

165.385 g/mol

6 0

3 years ago