B, but keep in mind the element sodium is very reactive (though table salts, on the other hand, are not).
The action is interaction
Answer:
10.69g/cm^3 or 0.0106kg/m^3
Explanation:
10.69 g/cm^3: I wrote this answer because your question doesn't mention whether volume is in cm^3 or m^3. If its in cm^3, then this is your answer.
0.0106kg/m^3: This might also be the answer if the volume is in m^3. If it is in m^3 then you have convert grams into kilograms.
So technically since you questions incomplete, the equation for measuring density is P= m/v
P= rho (density)
m= mass
v= volume
Hope it helps- Z
Answer:
C
Explanation:
The phosphate group PO4 is bonded covalently (bond between two non metals). While the sodium being bonded to the phosphorus atom is an ionic bond (bond between a metal and a non metal)
Activity (A) of an element is related to the number of atoms of that element N as follows:
A = k*N --------(1)
k = rate constant = 0.693/t1/2--------(2)
N = # moles of that element * Avogadro's number Na
For Sr: t1/2 = 28.8 yr
A(Sr) = 0.693/28.8 * N(Sr) = 0.0241 * N(Sr)
A(Sr) = 0.0241*(mass Sr/90)*Na= 0.000268 *mass Sr *Na ------------(3)
For Co : t1/2 = 5.26 yr
A(Co) = 0.693/5.26 *N(Co) = 0.1317 *N(Co)
A(Co) = 0.1317 * (1/60)*Na = 0.00219 * Na -------(4)
It is given that:
A(Sr) = A(Co)
0.000268 *mass Sr *Na = 0.00219 * Na
mass Sr = 0.00219/0.000268 = 8.17 g
