Answer:
Theres no answer choices so how are we
supposed to answer?
Answer:
5.5 grams
Explanation:
To find how much of the isotope remains, you need to use the half-life equation:
![N(t) = N_0(\frac{1}{2})^\frac{t}{h}](https://tex.z-dn.net/?f=N%28t%29%20%3D%20N_0%28%5Cfrac%7B1%7D%7B2%7D%29%5E%5Cfrac%7Bt%7D%7Bh%7D)
In this equation,
-----> N(t) = remaining mass (g)
-----> N₀ = initial mass (g)
-----> t = time (hrs)
-----> h = half-life (hrs)
You can find the remaining mass by plugging the given values into the equation and solving.
N(t) = ? g t = 30 hrs
N₀ = 22 g h = 15 hrs
<----- Half-life equation
<----- Insert values
<----- Simplify exponent
<----- Solve ![(\frac{1}{2} )^2](https://tex.z-dn.net/?f=%28%5Cfrac%7B1%7D%7B2%7D%20%29%5E2)
<----- Multiply 22 and 0.25
Answer:
5.4 tonnes.
Explanation:
The first step is to find the molar mass of Al2O3. Aluminum has a molar mass of about 27 and oxygen has a molar mass of about 16, so 2(27)+3(16)= 102g/mol=0.102kg/mol. 10200kg/0.102kg/mol=100,000 moles of Al2O3 in 10.2 tonnes. Multiplying this by the molar mass of the two aluminums, you get a total of 54*100,000=5400000g=5400kg=5.4 tonnes. Hope this helps!
<span>For better understanding, watch the structural formula:
</span>CH3 - CH - CH2 - CH2 - CH2 - CH - CH2 - CH3
...........|.......................................|.........................
..........CH3.................................CH3
Answer:
The condensed structural formula of 2,6-dimethyloctane
CH3 [CH2]8 CH<span>3</span>
Answer:
Explanation:Calculate the Energy Needed to Change a Solid Into a Liquid ... Heat of fusion is the amount of heat energy required to change the state of matter ... of fusion is: q = m·ΔHf; Note that the temperature does not actually change when ... Useful information: Heat of fusion of water = 334 J/g = 80 cal/g ... m = mass