Question

Mass of test tube & 250mL beaker 130.729g. Mass of test tube compound A 131.756g. Heat test tube and compound A. Mass of test tube 250 mL beaker and compound B 131.369g Add 2mL concentrated nitric acid to test tube and heat. Add 2mL of HNO3 and heat. Mass of test tube 250mL beaker compound C (CuO) 131.071g. Mass of test tube 250mL beaker and copper 130.997g.

Using your experimental data calculate: mass of copper in compounds A,B,C. Mass of other element in compound A and B. Mass of oxygen in compound C.

Answer 1

Answer on the question #47453, Chemistry, Other

Question:

Mass of test tube & 250mL beaker 130.729g. Mass of test tube compound A 131.756g. Heat test tube and compound A. Mass of test tube 250 mL beaker and compound B 131.369g Add 2mL concentrated nitric acid to test tube and heat. Add 2mL of HNO3 and heat. Mass of test tube 250mL beaker compound C (CuO) 131.071g. Mass of test tube 250mL beaker and copper 130.997g.

Using your experimental data calculate: mass of copper in compounds A,B,C. Mass of other element in compound A and B. Mass of oxygen in compound C.

Answer:

Mass of the compound A:

$$131.75 - 130.729 = 1.46 \text{ g}$$

Mass of compound B: $131.369 - 130.729 = 0.64 \text{ g}$

Mass of compound C: $131.071 - 130.729 = 0.342 \text{ g}$

Mass of cooper: $130.997 - 130.729 = 0.268 \text{ g}$

Mass of other compound: in A: $1.46 - 0.268 = 1.192 \text{ g}$

In B: $0.64 - 0.268 = 0.372 \text{ g}$

Mass of oxygen in C: $0.342 - 0.268 = 0.074 \text{ g}$

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