The answer is (3) 53.5 g/mol. The gram formula mass means that the mass of one mol compound. 1N=14, 4H=4, 1Cl=35.5. So the gram formula mass of NH4Cl=14+4+35.5=53.5 g/mol.
Answer:
56°
Explanation:
First calculate 
The interplanar spacing can be calculated from:
The diffraction angle is determined from:
Solve for 
The diffraction angle is:
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D. 8
You can predict it from it's name "Octet" means Eight. Atom must have that number of electron to have a stable structure!
Hope this helps!
Probably b because soil can’t be the exact same and so that cancels out a and d
