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2 years ago

If there are 25 grams of

Chemistry

1 answer:

Bas_tet [7]2 years ago

3 0

Answer:

40%

Explanation:

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Upal.

MissTica

Answer:

sodium

Explanation:

this is because sodium is neutral ....hence the pH formed will be 7

7 0

3 years ago

Plz help! The best answer will be marked as brainliest!

harina [27]

I heard Magnesium and Oxygen were going out.

So I was like, "OMg!"

6 0

3 years ago

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A mysterious white powder could be powdered sugar (C12H22O11), cocaine (C17H21NO4), codeine (C18H21NO3), norfenefrine (C8H11NO2)

konstantin123 [22]

Answer: norfenefrine $(C_8H_{11}NO_2)$

Explanation:

Depression in freezing point is given by:

$\Delta T_f=i\times K_f\times m$

$\Delta T_f=T_f^0-T_f=(-114.6-(-115.5)^0C=0.9^0C$ = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte)

$K_f$ = freezing point constant = $1.99^0C/m$

m= molality

$\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}}\times \text{weight of solvent in kg}}$

Weight of solvent (ethanol)= $density\times volume=0.789g/cm^3\times 1.50cm^3=1.18g=1.18\times 10^{-3}kg$

Molar mass of unknown non electrolyte = M g/mol

Mass of unknown non electrolyte added = 82 mg = 0.082 g (1g=1000mg)

$0.9=1\times 1.99\times \frac{0.082g}{M g/mol\times 1.18\times 10^{-3}}kg}$

$M=154g/mol$

The molecular mass of norfenefrine $(C_8H_{11}NO_2)$ is near to 154 and thus the identity of the white powder is norfenefrine .

4 0

3 years ago

the grams of carbohydrate in one apple if the apple has no fat and no protein and provides 72 kcal of energy

sergeinik [125]

<span>Carbohydrates have 4 kcal per gram of carbohydrates. (Protein is also 4 kcal/gram, while fat is 9 kcal/gram). Take the total kcal and divide by 4 kcal/gram: 72 kcal/(4 kcal/gram) = 18 grams carbohydrates.</span>

5 0

3 years ago

Which best describes what happens when 50 mL of 0.0010M CaCl2 is added to 50 mL of 0.010M Na2SO4? (The Ksp of CaSO4 = 2.4 × 10–5

Strike441 [17]

For [Ca +2 ]:
0.0010 mol/l · 0.05 l = $5 * 10^{-5} mol$
For [ SO4 -2 ] :
0.01 mol/l · 0.05 l = $5 * 10^{-4}$
Cumulative volume:
50 ml + 50 ml = 10 ml = 0.1 l
[Ca +2 ] = $\frac{5 * 10^{-5} }{0.1} = 5 * 10^{-4}$
[SO4 - 2] = $\frac{5*10^{-4} }{0.1}= 5* 10 ^{-3}$
Qc for CaSO4:
Qc = $5 * 10 ^{-4} * 5 * 10^{-3} = 25 * 10 ^{-7}= 2.5 * 10 ^{-6}$
This is less than Ksp of CaSO4.
Answer: C ) No precipitation will occur.

6 0

3 years ago

Read 2 more answers