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4 years ago

In medical imaging, radioactive substances are sometimes used to help "see" parts of the body.

Chemistry

1 answer:

Kaylis [27]4 years ago

4 0

This is true as some parts cannot be checked but the radioactive substances can be used in x-rays

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A sample of nitrogen gas had a volume of 500. mL, a pressure in its closed container of 740 torr, and a temperature of 25 °C. Wh

iren2701 [21]

Answer: Thus the new volume of the gas is 530 ml

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

$\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}$

where,

$P_1$ = initial pressure of gas = 740 torr

$P_2$ = final pressure of gas = 760 torr

$V_1$ = initial volume of gas = 500 ml

$V_2$ = final volume of gas = ?

$T_1$ = initial temperature of gas = $25^oC=273+25=298K$

$T_2$ = final temperature of gas = $50^oC=273+50=323K$

Now put all the given values in the above equation, we get:

$\frac{740\times 500}{298}=\frac{760\times V_2}{323}$

$V_2=530ml$

Thus the new volume of the gas is 530 ml

6 0

3 years ago

15 grams of HCl should theoretically produce 0.42 grams of H2. The reaction actually produced 0.15 grams of H2. What is the perc

Helen [10]

Answer:

35.7%

Explanation:

The percent yield is calculated by the formula:

<em>[(actual yield) / (theoretical yield)] * 100</em>

In this case, the actual yield is 0.15 grams, and the theoretical yield is 0.42 grams. So, putting these values into the equation, we have:

$\frac{0.15}{0.42} *100=0.357*100=35.7$

Thus, the percent yield of $H_2$ is 35.7%.

Hope this helps!

8 0

4 years ago

A solution labeled "0.105 M NaOH" would contain ______________ moles of NaOH in each liter of solution.

dem82 [27]

Answer:

A solution labeled "0.105 M NaOH" would contain 0.105 moles of NaOH in each liter of solution.

Explanation:

The concentration of a solution in Molarity (M) stands for the number of moles of that substance contained in 1 L of solution.

Molarity = Concentration in mol/L = (Number of moles of solute) ÷ (Volume of solution in L)

Molarity = Concentration in mol/L = 0.105 M = 0.105 mol/L

Number of moles of solute = ?

Volume of solution in L = 1 L

0.105 = Number of moles of solute × 1

Number of moles of solute = 0.105 mole

Hence, a solution labeled "0.105 M NaOH" would contain 0.105 moles of NaOH in each liter of solution.

Hope this Helps!!!

7 0

3 years ago

<img src="https://tex.z-dn.net/?f=%5Cred%7B%5Cunderbrace%7B%5Coverbrace%5Cmathbb%7B%5Ccolorbox%7Baqua%7D%7B%5Ccolorbox%7Bblue%7D

aleksandrvk [35]

Answer:

<h2>Physical properties: H2SO4 is a colorless or slightly yellow viscous liquid with a pungent odor. It has a density of 1.84 g/mL, boiling point of 337 °C, and melting point of 10 °C. "Concentrated" sulfuric acid is 98% in water, and is the most stable form.</h2>

6 0

3 years ago

4. If 0.130 g of p-aminophenol is allowed to react with excess acetic anhydride, what is the theoretical yield of acetaminophen

Dominik [7]

Hey There!

p-aminophenol (109.13 g/mol) + Ac2O (102.09 g/mol) ---> acetominophen (151.16 g/mol)

next, since you already know your limiting reactant (p-aminophenol), convert it to mols :

0.130 g / (109.13 g/mol) = 0.00119 moles

now that's your theoretical max, since its a 1:1 mol ratio, so multiply by the new molecular weight. :

0.00119 * 151.16 = 0.180 g

Hope that helps!

8 0

3 years ago