S t o i c h i o m e t r y. 4 C a l c u l a t i n g a m o u n t s o f r e a c t a n t s a n d p r o d u c t s i n c h e m i c a l r e a c t i o n s.

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S t o i c h i o m e t r y

4 C a l c u l a t i n g a m o u n t s o f r e a c t a n t s a n d p r o d u c t s i n c h e m i c a l r e a c t i o n s.

M a s s - M a s s P r o b l e m s 4 Y o u a r e g i v e n s o m e t h i n g. 4 W r i t e t h a t d o w n. 4 B e g i n F a c t o r - L a b e l. 4 Y o u a r e g i v e n s o m e t h i n g. 4 W r i t e t h a t d o w n. 4 B e g i n F a c t o r - L a b e l.

M a s s - M a s s P r o b l e m s 4 M u l t i p l y w h a t y o u a r e g i v e n b y a f r a c t i o n e q u a l t o o n e. 4 M u l t i p l y b y t h e m o l e r a t i o f r o m t h e b a l a n c e d e q u a t io n t o c h a n g e f r o m o n e s u b s t a n c e t o a n o t h e r. 4 M u l t i p l y w h a t y o u a r e g i v e n b y a f r a c t i o n e q u a l t o o n e. 4 M u l t i p l y b y t h e m o l e r a t i o f r o m t h e b a l a n c e d e q u a t io n t o c h a n g e f r o m o n e s u b s t a n c e t o a n o t h e r.

M a s s - M a s s P r o b l e m s U s u a l l y l o o k l i k e t h i s :

I f i r o n p y r i t e, F e S 2, i s n o t r e m o v e d f r o m c o a l, o x y g e n f r o m t h e a i r w i l l c o m b i n e w i t h b o t h t h e i r o n a n d t h e s u l f u r a s c o a l b u r n s. W r i t e a b a l a n c e d e q u a t i o n s h o w i n g t h e f o r m a t i o n o f i r o n ( I I I ) o x i d e a n d s u l f u r d i o x i d e.

B a l a n c i n g S t e p s 4 D i a t o m i c m o l e c u l e s 4 M e t a l s 4 N o n m e t a l s 4 O x y g e n 4 H y d r o g e n 4 R e c o u n t a l l a t o m s 4 D i a t o m i c m o l e c u l e s 4 M e t a l s 4 N o n m e t a l s 4 O x y g e n 4 H y d r o g e n 4 R e c o u n t a l l a t o m s

4 F e S O 2 2 F e 2 O S O 2

N o w t h e m a s s - m a s s p a r t : I f a f u r n a c e b u r n s a n a m o u n t o f c o a l c o n t a i n i n g g o f F e S 2, h o w m u c h s u l f u r d i o x i d e i s p r o d u c e d ?

1 0 0 g F e S 2 W r i t e w h a t y o u a r e g i v e n o n t h e f a c t o r - l a b e l f o r m W r i t e w h a t y o u a r e g i v e n o n t h e f a c t o r - l a b e l f o r m

1 0 0 g F e S 2 1 m o l e F e S g F e S g F e S 2 C o n v e r t g r a m s t o m o l e s

1 0 0 g F e S 2 1 m o l e F e S g F e S g F e S 2 2 m o l e S O 2 1 m o l e F e S 2 C h a n g e s u b s t a n c e s C h a n g e s u b s t a n c e s

1 0 0 g F e S 2 1 m o l e F e S g F e S g F e S 2 2 m o l e S O g S O 2 1 m o l e F e S 2 1 m o l e S O 2 C o n v e r t m o l e s t o g r a m s

100 g FeS 2 1 mole FeS 2 2 mole SO 2 64 g SO g FeS 2 1 mole FeS 2 1 mole SO g FeS 2 1 mole FeS 2 1 mole SO g FeS 2 1 mole FeS 2 2 mole SO 2 64 g SO g FeS 2 1 mole FeS 2 1 mole SO g FeS 2 1 mole FeS 2 1 mole SO g SO g SO 2 = =

P r a c t i c e

S t o i c h i o m e t r y E n d