What is the half life of a radioisotope if 25.0 grams of anoriginal 200.-gram sample of the isotope remainsunchanged after 11.46 days?3) 11.46 d1) 2.87 d4) 34.38 d2) 3.82 d
Answers
Answer 1
Answer:
Half-life is the amount of time, in days or years( most common) a certain substance disintegrate half of it's content.
We are given the initial (Ao) and final (A) amount of the substance. The time passed (T) is also given and we are asked to find the half-life (t). We use the equation below:
A=Aoe^(-ln2/t)T
25=200e^(-ln2/t)(11.46)
Solve for t
Answer: 3.82 days
We are given the initial (Ao) and final (A) amount of the substance. The time passed (T) is also given and we are asked to find the half-life (t). We use the equation below:
A=Aoe^(-ln2/t)T
25=200e^(-ln2/t)(11.46)
Solve for t
Answer: 3.82 days
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Select the correct answer.John is riding a ski lift to the top of Wildcat Mountain. He removes his gloves and rapidly rubs his hands together to warm them up. Whathappens when John rubs his hands?O A. The skin on his hands rapidly conducts heat, similar to metal.O B. He traps heat between his hands because skin is an insulator. ISO C. The particles In his hands vibrate faster because of friction.O D. Thermal energy moves from his fingertips to his palms.O E. He simulates a fever that'll raise his core body temperature.
1.09 L of a gas at standard temperature and pressure is compressed to 374 ml. what is the new pressure of the gas?
What would the pressure be if the can were heated to 1270∘C?
Why does the flow of science just keep going
Select the correct answer.John is riding a ski lift to the top of Wildcat Mountain. He removes his gloves and rapidly rubs his hands together to warm them up. Whathappens when John rubs his hands?O A. The skin on his hands rapidly conducts heat, similar to metal.O B. He traps heat between his hands because skin is an insulator. ISO C. The particles In his hands vibrate faster because of friction.O D. Thermal energy moves from his fingertips to his palms.O E. He simulates a fever that'll raise his core body temperature.
1.09 L of a gas at standard temperature and pressure is compressed to 374 ml. what is the new pressure of the gas?
What would the pressure be if the can were heated to 1270∘C?
Why does the flow of science just keep going
Answers
To simplify our solution for this probelm we first assume that the gas we are dealing with is an ideal gas. Given that it is ideal we can proceed the solution using the formula: PV=nRT where P is pressure (203KPa), V is volume (20.0 L), n is moles (required), T is absolute temperature (373K) and R is the gas constant ( 8.31 l-kpa/m-k). Plug in the given to the respective variables and you should get 3.28 moles of the gas sample.
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c) Ar (g)
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Answers
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Answers
Molar mass FeCl₂ = 126.751 g/mol
450 mL / 1000 = 0.45 L
1 mole ------- 126.751 g
? mole ------- 200 g
moles = 200 * 1 / 126.751
moles = 200 / 126.751
= 1.57789 moles FeCl₂
M = n / V
M = 1.57789 / 0.45
= 3.50 Mol/L or M
hope this helps!
450 mL / 1000 = 0.45 L
1 mole ------- 126.751 g
? mole ------- 200 g
moles = 200 * 1 / 126.751
moles = 200 / 126.751
= 1.57789 moles FeCl₂
M = n / V
M = 1.57789 / 0.45
= 3.50 Mol/L or M
hope this helps!
Answers
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