Noorhasan
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Which mass of solid residue can be obtained from the thermal decomposition of 4.10 g ofanhydrous calcium nitrate?
A 0.70 g
B 1.00 g
C 1.40 g
D 2.25 g
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an_atheist
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Write the balanced equation. This tells you the ratios of reagents to products.
Find the 'actual' number of moles of reagents used.
Using the ratio established in the equation, find the number of moles of 'useful' product
Find Formula mass for the product and multiply by the number of moles present to get an answer.
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Ishan_2000
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Write out a balanced symbol equation first, using state symbols. (It is the Thermal Decomposition of a Group 2 Nitrate)
Identify the solid in the products.

Then, calculate the formula mass of the anhydrous Calcium Nitrate, and the solid residue.

From here, it is simply a ratio.

You should get an answer that is less than half of 4.1g, (very rough estimate).
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Noorhasan
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(Original post by an_atheist)
Write the balanced equation. This tells you the ratios of reagents to products.
Find the 'actual' number of moles of reagents used.
Using the ratio established in the equation, find the number of moles of 'useful' product
Find Formula mass for the product and multiply by the number of moles present to get an answer.
Thanks, cheers!
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Noorhasan
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(Original post by Ishan_2000)
Write out a balanced symbol equation first, using state symbols. (It is the Thermal Decomposition of a Group 2 Nitrate)
Identify the solid in the products.

Then, calculate the formula mass of the anhydrous Calcium Nitrate, and the solid residue.

From here, it is simply a ratio.

You should get an answer that is less than half of 4.1g, (very rough estimate).
Thank you, have a good day!
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