Balance the following equation. What is the coefficient for hydrogen fluoride? SiO2 + HF →→SiF4 +H2O
A) 3
B) 2
C) 1
D) 4

ans .4

Explanation:

SiO2 +HF ⇒ SiF4 +H2O

reactant side                          product side

Si = 1                                    Si = 1      its balanced

O = 2                    O = 1    (× WITH 2 ) we got O =2 And H = 4

H = 1                                     H = 2  NOW H =4

F= 1   (×4)                                   F   = 4

now we get SiO2 +4 HF ⇒SiF4 +2 H2O

After multiply with number again check it. Si = 1, O = 2 ,H=4 ,F=4

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.