Question

靜

想問5-9 該怎麼算 ？

第一個選項就可以了

謝謝

the sample size?
(b) 250
ing?
211%
-6208
*(a) 500 mg.
*(c) 150 mg.
Xloo
to
10.4 ) X100% =0108
/
mg
506
016
5-8. A method of analysis yields masses of gold that are low
A
by 0.4 mg. Calculate the percent relative error caused
ylvila by this result if the mass of gold in the sample is
625
mg.6 20 (d) 70
(c) Dit X 106% 8.6
5-9. The method described in Problem 5-8 is to be used for
the analysis of ores that assay about 1.2% gold. What
minimum sample mass should be taken if the relatived)
error resulting from a 0.4-mg loss is not to exceed
*(a) -0.1%? (b) -0.4%? 5
* (c) -0.8%? (d) - 1.1%?
Slastin
0
(14)。

化學