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4 years ago

Please help on my science not sure what to put it under but here's the picture

Chemistry

1 answer:

Sergio [31]4 years ago

5 0

Answer:

How we can use images to promote and communicate science ... the cliché, “a picture tells a thousand words”, but there is real value in ... Images help us learn, images grab attention, images explain tough ... at BioMed Central, one thing I've realised is how vital images are in my role. ... Here's an example:.

Explanation:

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A 3.0 L solution contains 73.5 g of H2SO4. Calculate the molar concentration of the solution.0.25 M0.44 M0.75 M4.0 M

notka56 [123]

The molecular mass of $H_2SO_4$ is:

2·1 + 1·32 + 4·16 = 98 g/mol

The amount of solute, expressed by mol, is:

$73.5\ g\ H_2SO_4\cdot \frac{1\ mol}{98\ g} = 0.75\ mol\ H_2SO_4$

The molar concentration definition is: $M = \frac{mol\ solute}{volume (L)\ solution}$

Doing the calculations:

$M = \frac{0.75\ mol}{3\ L} = \bf 0.25\ M$

(If you detect any mistakes in my English report me them, please).

6 0

3 years ago

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Can somebody plz answer both questions correct!!! Only answer in 1-2 sentences.. that’s fine :)

Lynna [10]

Answer:

a chemical change is usually an irreversible chemical reaction. an example of this is rusting.

a physical change is usually visible while a chemical change isn't. also, a chemical change is irreversible while a physical change is.

Explanation:

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3 years ago

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As much as 25% of the fruits and vegetables grown in Chinese agricultural regions rot before they can be brought to market. Whic

Katarina [22]

B because he a enjoys d disused disused Keisha dkid

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3 years ago

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Consider the reaction: CO2(g) + CCl4(g) ⇌ 2 COCl2(g) ΔG° = 46.9 kJ Under the following conditions at 25 oC: LaTeX: P_{CO_2}P C O

Mamont248 [21]

Answer : The value of $\Delta G_{rxn}$ is, $-47.0kJ/mole$

Explanation :

The formula used for $\Delta G_{rxn}$ is:

$\Delta G_{rxn}=\Delta G^o+RT\ln K_p$ ............(1)

where,

$\Delta G_{rxn}$ = Gibbs free energy for the reaction

$\Delta G_^o$ = standard Gibbs free energy = 46.9 kJ

R = gas constant = 8.314 J/mole.K

T = temperature = $25^oC=273+25=298K$

$K_p$ = equilibrium constant

First we have to calculate the value of $K_p$ .

The given balanced chemical reaction is,

$CO_2(g)+CCl_4(g)\rightarrow 2COCl_2(g)$

The expression for reaction quotient will be :

$K_p=\frac{(p_{COCl_2})^2}{(p_{CO_2})\times (p_{CCl_4})}$

In this expression, only gaseous or aqueous states are includes and pure liquid or solid states are omitted.

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

$K_p=\frac{(0.653)^2}{(0.459)\times (0.984)}$

$K_p=0.944$

Now we have to calculate the value of $\Delta G_{rxn}$ by using relation (1).

$\Delta G_{rxn}=\Delta G^o+RT\ln K_p$

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

$\Delta G_{rxn}=-46.9kJ/mol+(8.314\times 10^{-3}kJ/mole.K)\times (298K)\ln (0.944)$

$\Delta G_{rxn}=-47.0kJ/mol$

Therefore, the value of $\Delta G_{rxn}$ is, $-47.0kJ/mole$

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3 years ago

You and your science group have been handed five mineral samples to identify. First, you sort the minerals by color. One has man

coldgirl [10]

im pretty sure it is b

tghj

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3 years ago