Thank you for visiting Determine the number of moles of molecules or formula units in each sample A 38 2 g sodium chloride B 36 5 g nitrogen monoxide. This page is designed to guide you through key points and clear explanations related to the topic at hand. We aim to make your learning experience smooth, insightful, and informative. Dive in and discover the answers you're looking for!
Answer :
A. 38.2 g NaCl: 0.654 mol, B. 36.5 g NO: 1.216 mol, C. 4.25 kg COâ‚‚: 96.57 mol, D. 2.71 mg CClâ‚„: 0.0000176 mol.
The following formula to convert grams (g), kilograms (kg), or milligrams (mg) of a substance to moles (mol):
moles (mol) = mass (g / kg / mg) / molar mass (g/mol)
Molar mass: This is the mass of one mole of a substance and is unique for each compound. You'll likely need a reference table to find the molar masses.
Let's solve for each sample:
A. 38.2 g sodium chloride (NaCl):
Find the molar mass of NaCl (approximately 58.44 g/mol).
Plug in the values: moles (mol) = 38.2 g / 58.44 g/mol = 0.654 mol (rounded to three decimal places)
B. 36.5 g nitrogen monoxide (NO):
Find the molar mass of NO (approximately 30.01 g/mol).
Plug in the values: moles (mol) = 36.5 g / 30.01 g/mol = 1.216 mol (rounded to three decimal places)
C. 4.25 kg carbon dioxide (COâ‚‚):
Convert kilograms (kg) to grams (g): 4.25 kg * 1000 g/kg = 4250 g
Find the molar mass of COâ‚‚ (approximately 44.01 g/mol).
Plug in the values: moles (mol) = 4250 g / 44.01 g/mol = 96.57 mol (rounded to two decimal places)
D. 2.71 mg carbon tetrachloride (CClâ‚„):
Convert milligrams (mg) to grams (g): 2.71 mg * 1 g/1000 mg = 0.00271 g
Find the molar mass of CClâ‚„ (approximately 153.82 g/mol).
Plug in the values: moles (mol) = 0.00271 g / 153.82 g/mol = 0.0000176 mol (rounded to six decimal places)
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