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3 years ago

Can I have help on this?

Chemistry

1 answer:

zhuklara [117]3 years ago

8 0

Answer:

H20

Explanation:

The acronym (I) used means it is liquid.

hope this helps

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Cuantos miles de sulfato de calcio están en 60 gramos de sustancia

seropon [69]

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4 years ago

Which of the following statements about natural resources is correct

trasher [3.6K]

Answer:

The right choice is "wind power requires a lot of space and depends on local weather patterns "

Explanation:

solar power produces harmful chemicals

it is incorrect because solar power doesn't produce any chemicals

2. geothermal power requires more land than other power plants

it is incorrect because geothermal power requires digging a stable 5 km-deep shaft not a land

3. nuclear power produces small amounts of energy from large masses

it is incorrect because nuclear power produces large amounts of energy from small masses.

So the right choice is "wind power requires a lot of space and depends on local weather patterns "

7 0

3 years ago

A folded rock can wear away, allowing new layers to be laid down on much older rocks. The meeting of these two rock layer create

Rashid [163]

Answer:

Subscribe to JiDion :)

Explanation:

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3 years ago

A chemistry graduate student is given 125.mL of a 0.20M acetic acid HCH3CO2 solution. Acetic acid is a weak acid with =Ka×1.810−

Over [174]

Answer : The mass of sodium acetate is, 1.097 grams.

Explanation : Given,

The dissociation constant for acetic acid = $K_a=1.8\times 10^{-5}$

Concentration of acetic acid (weak acid)= 0.20 M

volume of solution = 125. mL

pH = 4.47

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

The expression used for the calculation of $pK_a$ is,

$pK_a=-\log (K_a)$

Now put the value of $K_a$ in this expression, we get:

$pK_a=-\log (1.8\times 10^{-5})$

$pK_a=5-\log (1.8)$

$pK_a=4.74$

Now we have to calculate the concentration of sodium acetate (conjugate base or salt).

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

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

$4.47=4.74+\log (\frac{[Salt]}{0.20})$

$[Salt]=0.107M$

Now we have to calculate the mass of sodium acetate.

$\text{Concentration}=\frac{\text{Mass of }NaCH_3CO_2\times 1000}{\text{Molar mass of }NaCH_3CO_2\times \text{Volume of solution (in mL)}}$

$0.107M=\frac{\text{Mass of }NaCH_3CO_2\times 1000}{82g/mol\times 125mL}$

$\text{Mass of }NaCH_3CO_2=1.097g$

Therefore, the mass of sodium acetate is, 1.097 grams.

6 0

4 years ago

What is the empirical formula for butane, C4H10

pochemuha

C2H5 i think by ÷2 on both

4 0

3 years ago