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What is the mass, in grams, of one copper atom? A. 1.055  10-22 g





@ Hydrochloric acid can be prepared by the following reaction:
2NaCl(s) + H2SO4(aq)  2HCl(g) + Na2SO4(s)
How many grams of HCl can be prepared from 2.00 mol H2SO4 and 150 g NaCl?



A compound has the empirical formula CH and molecular mass 78.11 g.
The molecular formula could be written as:
A. C2H2
B. C4H4
C. C5H5
D. C6 H6 *



@How many grams of sulfur (S) are needed to react completely with 246 g of mercury (Hg) to form HgS?
A) 39.3 g
B) 24.6 g
C) 9.66 × 103 g
D) 201 g




@ Hydrochloric acid can be prepared by the following reaction:

2NaCl(s) + H2SO4(aq) ® 2HCl(g) + Na2SO4(s)

How many grams of HCl can be prepared from 2.00 mol H2SO4 and 150 g NaCl?
A. 7.30 g
B. 93.5 g
C. 146 g
D. 150 g
E. 196 g