General Chemistry

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Questions?

kay mag question sad mi

Multiple Choice

What is the unit for molecular weight?

• M

• g/mol

• m

• g'mol

Multiple Choice

Sodium (Na) and Chlorine (Cl) have atomic weights of 22.9 g/mol and 35.5 g/mol respectively. What is the molar mass of Sodium Chloride (NaCl)?

• 60.0 g/mol

• 56.4 g/mol

• 57.0 g/mol

• 58.4 g/mol

Multiple Choice

How many moles of Sodium Chloride (NaCl) are there in a 175 g sample?

• 5

• 4

• 3

• 2

Questions?

solve ta sunod baya

Multiple Choice

What do we do next?

• Convert % values to grams

• Convert % values to moles

Multiple Choice

What is the primary ratio of 1.25 mol Iron (Fe) and 1.88 mol Oxygen (O)?

• 1.5:1

• 3:2

• 1:1.5

• 2:3

Multiple Choice

Is FeO_1.5 the final empirical formula of the substance?

• Yes

• No

Questions?

last part na hehe

Multiple Choice

What do we next?

• Divide the molar mass by the empirical mass

• Identify the ratio between the given values

• Determine the molar mass of the compound

Multiple Choice

What do we do next?

• Divide the given mass by the empirical formula mass

• Solve for the empirical formula

Multiple Choice

Carbon (C) has an atomic weight of 12.011 g/mol, Hydrogen (H) has 1.008 g/mol, and Oxygen (O) has 15.999 g/mol. What is the empirical mass of CH₂O?

• 29.018 g/mol

• 30.026 g/mol

• 58.036 g/mol

• 18.015 g/mol

Multiple Choice

We know that its molar mass is 90 g/mol and its empirical formula is CH₂O with a mass of 30.026 g/mol. What is the molecular formula of the compound?

• CH₆O₃

• C₂H₆O₂

• C₂H₄O₂

• C₃H₆O₃