Answer:
A
Explanation:
Considering question A
Mass of original sample is 
Mass of NH4Cl is 
Percent of NH4Cl is 
B
Mass of NaCl 
C
Mass of SiO2 
D
Mass of original sample 
Differences in these weights (g) (use the absolute value of the difference)
recovery of matter
The correct option is C
From the question we are told that
The mass of evaporating dish on #1 is 
The mass of evaporating dish and original sample 
The mass of evaporating dish after subliming
is 
Generally the mass of the original sample is mathematically represented as

=> 
=> 
Generally the mass of
is mathematically represented as

=> 
=> 
The Percent 

=> 
=> 
Considering question B
The mass of evaporating dish #2 is 
The mass of watch glass is 
The mass of evaporating dish #2, watch glass and NaCl 
Generally the mass of NaCl is
![m_k = m_b -[m_g + m_a]](https://tex.z-dn.net/?f=m_k%20%20%3D%20%20m_b%20-%5Bm_g%20%2B%20m_a%5D)
=> ![m_k = 67,355 -[38700 + 28 299]](https://tex.z-dn.net/?f=m_k%20%20%3D%20%2067%2C355%20%20-%5B38700%20%2B%2028%20299%5D)
=> 
Considering question C
The mass of evaporating dish is 
The mass of evaporating dish and SiO2 
Generally the mass of SiO2 is mathematically represented as

=> 
Considering D
The mass of the original sample is 
Generally the experimental mass recovered (NH_4Cl,NaCl, SiO2 ) is mathematically evaluated as


Generally the differences in these weights (g) of recovery of matter is mathematically represented as.

=>
While drying the NaCl, the liquid boiled and some splattered out of the evaporating dish, causing the recovered mass to be lower.