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3 years ago

How many grams of drug powder would you need to weigh to prepare 32ml of a suspension that should have a strength of 20mg/ml?

Chemistry

2 answers:

butalik [34]3 years ago

8 0

15 grams for the drug powder

Levart [38]3 years ago

3 0

Answer:

The answer is 0.64 g of drug powder.

Explanation:

Let "x" be the grams needed to prepare a 20 mg/mL mass concentration solution, let "V" be the volume of the solution, in this case 32 mL, therefore the mass concentration will be equal to:

mass concentration = x/V

Clearing x, we have:

x = mass concentration * V = (20 mg/mL) * (32 mL) = 640 mg

one gram is one thousand milligrams, therefore, we have:

640 mg * 1 g/1000 mg = 0.64 g

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3 years ago

What is 93,000,000 in scientific notation?

DanielleElmas [232]

I believe it is 9.3x10^7

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3 years ago

How many moles of ions would you expect in an aqueous solution containing one mole of chromium(III) chloride? Hint: write out th

Cerrena [4.2K]

Answer:

Four

Explanation:

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3 years ago

how many milliliters of 1.50 m hno3 contain enough nitric acid to dissolve an old copper penny with a mass of 3.94 g?

Lerok [7]

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hope this helps!

5 0

3 years ago

Explain your reasoning. Match each explanation to the appropriate blanks in the sentences on the right.

skelet666 [1.2K]

Answer:

A (I_2(g), Br_2 (g), Cl_2 (g), F_2 (B): The ranking can best be explained by the trend entropy decreases as 5. molar mass decreases.

B (H_2O_2 (g), H_2S(g), H_2O(g): The ranking can best be explained by the decreases a trend entropy decreases as 3. molar mass and structure complexity decreases.

C. (C(s, amorphous), C(s, graphite), C(s, diamond): The ranking can best be explained by the trend entropy decreases as 4. structure complexity decreases.

Explanation:

Hello.

In this case, we can understand a higher entropy when more disorder is present and a lower entropy when less disorder is present, thus:

A (I_2(g), Br_2 (g), Cl_2 (g), F_2 (B): The ranking can best be explained by the trend entropy decreases as 5. molar mass decreases since iodine has the greatest molar mass (254 g/mol) and fluorine the least molar mass (38 g/mol).

B (H_2O_2 (g), H_2S(g), H_2O(g): The ranking can best be explained by the decreases a trend entropy decreases as 3. molar mass and structure complexity decreases since hydrogen peroxide weights 34 g/mol as well as hydrogen sulfide but the peroxide has more bonds (more complex, higher entropy).

C. (C(s, amorphous), C(s, graphite), C(s, diamond): The ranking can best be explained by the trend entropy decreases as 4. structure complexity decreases since diamond has a well-ordered structure and amorphous carbon has a very disordered one.

Best regards.

4 0

3 years ago