A 1.63-g sample of metal sulfate, Mx(SO4)y, is dissolved in water, acidified with HCl, heated, and treated with excess barium chloride. The barium sulfate that formed weighed 3.33 g. Determine the percent sulfate in the compound Mx(SO4)y. 72.7% 41.2% 55.1% 84.2% None of these. 67.6%
1.
A 1.63-g sample of metal sulfate, Mx(SO4)y, is dissolved in water, acidified with HCl, heated, and treated with excess barium chloride. The barium sulfate that formed weighed 3.33 g. Determine the percent sulfate in the compound Mx(SO4)y.
72.7%
41.2%
55.1%
84.2%
None of these.
67.6%
2.
Similar to the Types of Reactions Lab, you have been tasked with assembling a reactivity series using data from reactions setup on Planet X. In some cases nitrate salts and hydrochloric acid were used. Use the results below to determine the relative activities of the two elements involved in each reaction and then place the elements in an activity series in order of decreasing activity.
most reactive >> least reactive
Reaction: |
Balanced equation: |
| 1 |
Bz(s) + Sm(NO3)2(aq) --> Bz(NO3)2(aq) + Sm(s) |
| 2 | Sm(s) + HCl(aq) --> H2(g) + SmCl2(aq) |
| 3 |
Zx(s) + Sm(NO3)2(aq) --> NR |
| 4 |
Zx(s) + HCl(aq) --> NR |
Sm > H2 > Zx > Bz
Zx > H2 > Sm > Bz
Bz > Zx > H2 > Sm
Bz > H2 > Sm > Zx
Bz > Sm > H2 > Zx
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