SAT Subject Test Chemistry,10 edition

5.5 moles

54 . C

Total   molecular   weight: 108 +   28  +   6   =   142

Percent Ag: (108/142)   ×   100%    =   76.1%

55 . C
Balanced equation: C 3 H 8 + 5O 2 → 3CO 2 + 4H 2 O

Therefore,  oxygen  is  the limiting    reagent;    5   moles   of  O 2     and one mole    of  C 3 H 8     will    form    3   moles

of  CO 2.

3   moles   x   44  g/mol   =   132 g   CO 2

56 . A
P 1 V 1 = P 2 V 2 is the equation you will use.

57 . D

60  is  the mass    number  (the    number  of  protons +   the number  of  neutrons).  27  is  the atomic

number  (the    number  of  protons).   In  a   beta-decay  reaction,   the atomic  number  increases   by

one as  a   neutron turns   into    a   proton  and an  electron    that    is  ejected.