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Edit View History Bookmarks Window Help session masteringchemistrycom Chem& 161 Su 16 Section B Exercise 3.44 Part A Exercise 3.44 How many moles of Na are present in the crystal? Express your answer to two significant figures and include the appropriate A NaCl crystal has a mass of 0.16 mg Value Units Submit My Answers Give Up Incorrect. Try Again: no points deducted Enter your answer using dimensions of amount of substance. Part B How many Na ions are present? Express your answer using two significant figures 2610 000 in related terms, another unt of mass often used is Dalton (Da) or unified atomic mass unit (u when describing atomic masses and molecular masses. It is defined to be 1212 of the mass of one atom of carbon-12 and older w

Explanation / Answer

Part A:

Moles of Na+ = grams / Molar mass = 1.6 * 10-4 g / 58.44g/mol = 2.74 * 10-6 mol Na+

Part B:

Na+ ions = Moles of Na+ * avogadro's Number = 2.74 * 10-6 * 6.023 * 1023 = 1.65 * 1018 ions

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