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【简答题】
为测定某石灰石样品中碳酸钙的含量，取10g样品于烧杯中再向其中加入足量的稀盐酸，完全反应后（杂质不反应），产生的二氧化碳为1.76g。 试求石灰石样品中碳酸钙的质量分数（写出计算过程）。 （化学反应程式：CaCO 3 ＋2HCl = CaCl 2 ＋H 2 O＋CO 2 ↑）
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】For some real number A, the graph of the line y=(A+1)x+8 in the standard (x,y) coordinate plane passes through (2,6). What is the slope of this line?
A.
-4
B.
-3
C.
-1
D.
3
E.
7
【判断题】Forced-draft cooling towers force air inmechanically by the use of fans on the top side of the tower.
A.
正确
B.
错误
【简答题】Forced-draft cooling towers force air inmechanically by the use of _______ on the lower side of the tower.
【简答题】Is the positive integer y a prime number? (1) 80＜y＜95 (2) y=3x+1, where x is a positive integer
【简答题】An_______ tower is anotherkind of cooling tower that produces airflow mechanically (Figure 8.6). Itdiffers from the forced-draft cooling tower in that it pulls air ______ the tower rather than forcing...
【简答题】number = (number)
x = y = z = (x)
(y)
(z)
a, b = , (a)
(b)A. 2 1 1 1 1 2 B. 1 1 1 1 1 2 C. 1 2 1 1 1 2 D. 1 1 1 1 2 2
【单选题】The number “ 1 “ in room number or telephone number is read as
A.
y ā o
B.
yào
C.
yóu
D.
y ī
相关题目：
【简答题】Is the positive integer y a prime number? (1) 80＜y＜95 (2) y=3x+1, where x is a positive integer