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Answer:
See below
Explanation:
The atmosphere of the earth hundreds of millions of years ago was only water vapour and carbon, both from the one ocean that existed around the continental body of Pangea. The photosynthesis process and exache (⊕) caused the percentages to decrease.
Answer:
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Explanation:
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Answer:
- The theoretical yield of lithium carbonate = 0.6659 g.
- The percent yield = 99.11%.
Explanation:
- Lithium hydrogen carbonate is decomposed by heating according to:
<em>2LiHCO₃(s) → Li₂CO₃(s) + H₂CO₃(g).</em>
<em>It is clear that 2.0 moles of lithium hydrogen carbonate produce 1.0 mole of lithium carbonate.</em>
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- We need to calculate the no. of moles of (1.225 g) lithium hydrogen carbonate decomposed:
no. of moles of lithium hydrogen carbonate = mass/molar mass = (1.225 g)/(67.96 g/mol) = 0.018 mol.
- 0.02 mol of lithium hydrogen carbonate is decomposed to produce (0.02 mo /2 = 0.009 mol) of lithium carbonate.
<em>∴ The theoretical yield of lithium carbonate = no. of moles x molar mass</em> = (0.009 mol)(73.89 g/mol) = <em>0.6659 g.</em>
<em>∵ The percent yield = (actual yield/theoretical yield) x 100 = (0.660 g / 0.6659 g) x 100 = 99.11%.</em>