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daser333 [38]
3 years ago
14

Which part of the experiment is not touched by the independent variable or is the normal/comparison

Chemistry
1 answer:
kobusy [5.1K]3 years ago
8 0
The part of the experiment that’s is not touched by the independent variable and is for comparison is called the :
Control Group
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The following reaction shows sodium carbonate reacting with calcium hydroxide.
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Ans: 15.1 grams

Given reaction:

Na2CO3 + Ca(OH)2 → 2NaOH + CaCO3

Mass of Na2CO3 = 20.0 g

Molar mass of Na2CO3 = 105.985 g/mol

# moles of Na2CO3 = 20/105.985 = 0.1887 moles

Based on the reaction stoichiometry: 1 mole of Na2CO3 produces 2 moles of NaOH

# moles of NaOH produced = 0.1887*2 = 0.3774 moles

Molar mass of NaOH = 22.989 + 15.999 + 1.008 = 39.996 g/mol

Mass of NaOH produced = 0.3774*39.996 = 15.09 grams


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