A3.540-g sample of an unknown metal m is burned in the presence of excess oxygen, producing the oxide m2o3(s) and liberating 18.56 kj of heat at constant pressure. what is the identity of the metal? 4m(s) + 3o2(g) → 2m2o3(s) substanceδh°f (kj/mol) yb2o3(s)–1814.6 tb2o3(s)–1865.2 sm2o3(s)–1823.0 sc2o3(s)–1908.8 y2o3(s)–1905.3 a) sm b) tb c) y d) sc e) yb

a) Sm

Explanation:

Hello,

This substantiation could be done by knowing how to compute the released energy for 1 mol the oxide. Thus, for Sm, the computation turns out into:

The sign just indicates that the heat is released due to the chemical reaction and it matches with the indicated heat in the statement.

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c)red bank

explanation:

red bank is a borough in monmouth county, new jersey, incorporated in 1908 and located on the navesink river, the area's original transportation route to the ocean and other ports.

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.