Page 57 - الكيمياء كتاب الطالب للصف 11 الفصل 1

z yfy^a 5 j a 6% £ yi a -%ra

`=Ø C : ± d C: DÛ R: ± ` E;Û= d ¹b b R0; ^ E9 P P R C D R: E= ÒM± E5=0 ± ¹C ¯ `8: Ò

¤`=Ø= Š±

E9 ­

Ð Û b8 –^ C ^8/ »b6 b6 ± ` 1.55 g ̱R ± P; ˜œ d 0.486 g a 9 Ïb= =; C: ± ` X R ÌR _ ˜›
E= ÒM± E5=0 ± H ; ± ˜»b6 b6 ± P= ­ ` 3.55 g ˜Ïb= =; C: ± P= ­ ` 0.806 g a; H ; «±b< ±
˜H C; ± »b6 b6 ± P= M ˜Ïb= =; C: ± P= M E= ÒM± E5=0 ± H ; ±

“^ 9 ÓR ­ E7 R2 d Š± ÎÒP ± ϱP ± ];8: ’ ¤ Û ^'± ¤ Û ^'±

Ïb= =; C: ± Z P ± ÔQ ± `= M± E9 D ±
P O ´±b2 ± ¦
(0.806 – 0.486) = 0.320 g
1.55 g í
R0; ^ E9 ^ ¤› ³b2 ± `= M±Ò Ïb= =; C: ± ´„b ¹P D ±
= 2.00 g ¦
¤E 4 ± E C b
1.55 g 2.00 g (m) E9 8 ±
31.0 g/mol 16.0 g/mol ^ 8 ± c9 _ ± ¤œ ³b2 ± § (n) ´„b: ± ¹P
´„b: ± ¹P ¹C ˆ E Û»Q ± (A ) E= ; ± E »Q ± E9 8 ±
r
= 0.05 mol = 0.125 mol 0.486 g
Mg ´„b ¹P = = 0.0200 mol
0.05 0.125 24.3 g/mol
0.05 0.05 ¹P4 ± c9 _ ± ¤ ³b2 ±
E b : ± ´„b: ± ¹P ` Û^ M± O ´„b ¹P = 0.320 g = 0.0200 mol
= 1 = 2.5 16.0 g/mol
PO E C; ± E5=0 ± D ± ¤ž ³b2 ± ´„b: ± ¹P c9 E b : ± ´„b: ± ¹P _ ±
2.5 ¦
Ôb Û „­ D ¤Ÿ ³b2 ± ˜ÓR50 ±
¥E R ¹±P ­ c9 E C; ± E5=0 ± d `= M± ¤Ïb= =; C:9 E= b E X ­ ¦
E5=0 ± ²R1 R 8 ± ` V9 9 Ò Ïb= =; C: ± P= M E= ÒM± E5=0 ± ÐA –±Q 1:1
P O
2 5 ÏC »­ c ¯ Îbjb9 `=4 _ » d ˜(MgO) d
E C; ± E5=0 ± ÑQ d ˜E = j
Ć d ²R1

d C: DÛ R: ± d ¹b b R0; ^8 E=9 8 ± E b : ± E ; ± d24 d ± ´C C= ± ` E= ÒM± E5=0 ± ¶C ; ± `8: C:
¤d Š± ÎC : ±

ÎC

E5=0 ± H ; ± –14.3% C »±P7 E=9 E ; (H) `= Ò»P= Ò 85.7% C »±P7 E=9 E ; (C) Ðb R ` Ðb8 D R ˜
˜d b R Ò»P=< ± D R: ± ±Q< E= ÒM±

¤ Û ^'±
C H ´±b2 ±
85.7 14.3 R0; ^8 E=9 8 ± E b : ± E ; ± ¤› ³b2 ±

85.7 = 7.142 14.3 = 14.3 A c9 _ ± ¤œ ³b2 ±
12.0 1.0 r
7.142 14.3 R5jM± ¹P4 ± c9 _ ± ¤ ³b2 ±
= 2
= 1
7.142 7.142
(CH ) d D R:9 E= ÒM± E5=0 ± Ðb8 d C C Ò
2

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