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Katen [24]
4 years ago
8

A patient administered 20 mg of iodine-131. How many mg of this radioactive isotope will remain the body after 24 days? NEEDS AN

SWER ASAP
Chemistry
1 answer:
vredina [299]4 years ago
7 0

Answer:

I need the answer too someone plzzz answer this!!!

Explanation:

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What is the density of 0.50 grams of gaseous carbon stored under 1.5 atm of pressure at a temperature of -20.0 C?
Colt1911 [192]

Answer: The density of 0.50 grams of gaseous carbon stored under 1.50 atm of pressure at a temperature of -20.0 °C is 0.867 g/L.

Explanation:

  • d = m/V, where d is the density, m is the mass and V is the volume.
  • We have the mass m = 0.50 g, so we must get the volume V.
  • To get the volume of a gas, we apply the general gas law PV = nRT

P is the pressure in atm (P = 1.5 atm)

V is the volume in L (V = ??? L)

n is the number of moles in mole, n = m/Atomic mass, n = 0.50/12.0 = 0.416 mole.

R is the general gas constant (R = 0.082 L.atm/mol.K).

T is the temperature in K (T(K) = T(°C) + 273 = -20.0 + 273 = 253 K).

  • Then, V = nRT/P = (0.416 mol)(0.082 L.atm/mol.K)(253 K) / (1.5 atm) = 0.576 L.
  • Now, we can obtain the density; d = m/V = (0.50 g) / (0.576 L) = 0.867 g/L.
6 0
4 years ago
What is alchemy?
Naily [24]

Answer:  A. An early form of chemistry that people used to try to turn metal

into gold.

Explanation:

Alchemy is indeed an early form of chemistry in which people try to turn metal into gold.

6 0
3 years ago
Write down as many correct, distinct, and relevant facts you can about the following prompt: 100 mL of 1.0 M solution H2SO4 is a
galben [10]

Answer:

Explanation:

From the equation:

H2SO4(aq) + 2NaOH(aq) --> Na2SO4(aq) + 2H2O (l)

<em>1 mole of the acid (H2SO4) and 2 moles of the base (NaOH) are required for complete neutralization.</em>

mole of acid (H2SO4) present = molarity x volume

                                  = 1 x 0.1 = 0.1 mole

Mole of base (NaOH)  present = mass/molar mass

                                                      = 7/40 = 0.175 mole

<em>The ratio of acid and base should be 1:2, hence the acid is slightly excessive in this case and the base is the limiting reagent that will determine the extent of the reaction.</em>

Amount of excess acid = 0.1 - 0.175/2

                                       = 0.0125 mole

volume of excess acid = mole/molarity

                                      = 0.0125 x 1 = 0.0125 L

                                       = 12.5 mL

<em>Hence, the acid (H2SO4) was in excess by 12.5 mL.</em>

8 0
3 years ago
Will give 50 points, If a decrease in temperature accompanies a reaction, what occurred?
Ede4ka [16]

Answer:

A.

Explanation:

3 0
3 years ago
Read 2 more answers
When an ion has a positive charged what has the highest value of this ion ?
Zarrin [17]

Answer:

  • Highest charge +4
  • Proton

Explanation:

Why +4?

  • Elements have valency starting from -4 to +4

  • Point to be noted that only Carbon family elements can show +4 or -4 valency
8 0
3 years ago
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