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Nostrana [21]
3 years ago
12

Which of the following statements is true? Choose one: A. Bronze was used as early as 4000 B.C.E. to replace less-desirable iron

tools. B. Bronze is harder than copper, so it retains a cutting edge sharper than that of copper. C. Bronze is an alloy of copper and chromium. D. Copper is not easily smelted, because extremely high temperature is required.
Chemistry
1 answer:
Verizon [17]3 years ago
4 0

Answer:

B.Bronze is harder than copper, so it retains a cutting edge sharper than that of copper.

Explanation:

The importance of bronze in the history of the human kind can not be only measured in the durability but the help that it provided to our ancestors, the things they were allowed to do once they dicovered how to mold it, and the tools that they produced and made many every day tasks easier for them and the ability of bronze to mantain the cutting edge longer than copper was one of the main reasons why it took its places in the fabrication of many tools.

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1 mole of carbon dioxide contains a mass of 44 g, out of which 12 g are carbon. 
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Therefore, with the amount of carbon and hydrogen from the hydrocarbon we can calculate the empirical formula.
We first calculate the number of moles of each,
Carbon = 2.3073/12  = 0.1923 moles
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  0.1923/0.1923 : 0.2889/0.1923
                       1 :  1.5
                      (1 : 1.5) 2
                     = 2 : 3
Hence, the empirical formula of the hydrocarbon is C2H3
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