Explanation:
number b is the answer for the question
Answer:
The mass of 3.5 moles of Ca is 140 g to two significant figures.
Explanation:
Answer:
Explanation:
From this question, we are to fill in the blanks with the appropriate correct answers.
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NOTE: that the electron-withdrawing groups decrease the electron density around the proton nucleus and therefore the nucleus feels the external magnetic field more. Hence, it requires a larger frequency to attain resonance(downfield).