Answer:
Explanation:
To convert from moles to grams we must use the molar mass, which can be found on the Periodic Table.
- Aluminum (Al): 26.981538 g/mol
Use this number as a fraction.
Multiply by the given number of moles.
The moles of aluminum will cancel.
The original number of moles, 0.500, has 3 significant figures, so our answer must have the same.
For the number we calculated, that is the tenth place. The 9 in the hundredth place tells us to round the 4 to a 5.
There are about <u>13.5 grams of aluminum</u> in 0.500 moles.
It’s option B 0.0821L.atm/mol.K
Answer: norfenefrine 
Explanation:
Depression in freezing point is given by:
= Depression in freezing point
i= vant hoff factor = 1 (for non electrolyte)
= freezing point constant = 
m= molality
Weight of solvent (ethanol)= 
Molar mass of unknown non electrolyte = M g/mol
Mass of unknown non electrolyte added = 82 mg = 0.082 g (1g=1000mg)
The molecular mass of norfenefrine is near to 154 and thus the identity of the white powder is norfenefrine .
The answer is A. 2 electrons will go in 1s orbital, 2 more electrons will go in 2s orbital. because the last 5 electrons will go in the 2p orbital but you only want the s orbitals
