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<span>What activates a convection current, starting the flow of a fluid ?
Answer: </span>
<span>D. Temperature differences in the mantle
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Answer:
Case Study: General Andrew Jackson: Andrew Jackson's military career spanned several wars including the American Revolution, the Creek War, the War of 1812, and the First Seminole War. After the Creek War, Jackson and the Creek Indians signed the
Answer: 5 water molecules
Explanation:
Decomposition of hydrated copper sulphate is given by:
![CuSO_4.xH_2O\rightarrow CuSO_4+xH_2O](https://tex.z-dn.net/?f=CuSO_4.xH_2O%5Crightarrow%20CuSO_4%2BxH_2O)
Molar mass of
= 159.6 g/mol
According to stoichiometry:
(159.6+18x) g of
decomposes to give = 159.6g of ![CuSO_4](https://tex.z-dn.net/?f=CuSO_4)
Thus 7.74 g of
decomposes to give=
g
But it is given 7.74 g of a sample of hydrated salt was found to contain 4.95 g of anhydrous salt.
Thus we can equate the two equations:
![\frac{159.6}{159.6+18x}\times 7.74=4.95](https://tex.z-dn.net/?f=%5Cfrac%7B159.6%7D%7B159.6%2B18x%7D%5Ctimes%207.74%3D4.95)
x=5
Thus there are 5 water molecules associated with each
formula unit.
Osmosis is the diffusion of water from a high concentration to a lower concentration
Answer:
18.45 g of C
Explanation:
This is a problem of rules of three:
1 mol of C₃H₈ contains 3 moles of C and 8 moles of H
If 8 moles of H are contained in 1 mol of propane
4.10 moles of H are contained in (4.1 . 1) /8 = 0.5125 moles
Now, If 1 mol of propane contains 3 moles of C
0.5125 moles of propane may contain (0.5125 . 3) / 1 = 1.5375 moles of C
Let's convert the moles to mass:
1.5375 mol . 12 g /mol = 18.45 g