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> ):! ma~1K,i11111 is :ill\1\\'cd to rL·ac1\\ ilh .1.00 g c1x)1!L'll gas. the ~ok pniduct is
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lll,iµnL·~iuni i,, idt· .. \ lh:r the rt'ill'tion. no rn:1g11 c~i 11111 rclllains :mcl 1hc 111:1ss oi' t1 nrc:,ctcd
,,\~):!t'n is 2.177 i;. \\'hat i!- tht· percent
p1\1duccJ·~
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lll:ISS
o!'t1xygc11 i11 the 11111g11csi 111n oxide
\\'rite acceptable 11:imc!- r9r the fo llowin g ionic co111pou11cls
:i) l i1N
h) _.\ l~S:i
Hg1Cb
Ji) Naivln04
--.1( \\'hen 2AO g h~ drogcn gas w:is allowed to react wi th an excess or oxygen, 21.45 g waler
w::is obtai ned. In a second experimen t, hydrolysis of'J5.50 g water produced 3 1. 53 g
c)
1
,oxygen. Sho" · that these results [Ll'e consis!ent with !he l~1w or constant compositi on.
--4. The ami no acid rneLhionin c, which is essential in human diets, has the molecular fo rmula
C5ll 11 N0 2. Determine
a) lts molecular mass
1
b) The mass or hydrogen per mole of methionine
c) The number of C atoms in 2.5 mo] methionin e
- 5. Determi ne the mm1ber of protons, neutrons and elecl.rons in the fo llowing species.
a) 22sR.n2+
t,) ,os:.,d
c) 60C 0 2,.
d) 1 24 S 11 2 ➔
~6. In one experiment, the burning of 0.213 g sul fur in excess oxygen produced 0.639 g
sulfur triox ide as the sole product of the reacti on. fn a second experiment, 1.590 g sulfur
tri ox ide was obtained. Whal mass of sul fur must have been burned in lhe second
experi ment?
_y State the law of definite proportions.
8. What is the mass of ca2➔ ions in 2.0 g CaCl2(s)?
..J). Write a balanced equati on for the reaction in which iron(! I) sulfate reacts with ammonia
/ as and liquid water lo produce iron(III) hydrox ide and ammonium sulfate.
\ j,0. State two(2) uses of radi oisotopes.
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