Random
The masses on the Periodic Table can be used with what two different units?
grams and AMU (Atomic Mass Units)
Given that a 95.2g sample contains 40.8g of Carbon and 54.4g of Oxygen, determine the empirical formula.
Empirical Formula: Carbon Monoxide - CO
What is the simple equation used to determine percent composition?
Part / Whole x 100
What is the Molar Mass of NaCl?
58.5 g/mol
6.02 x1023 representative particles is known as
Avogadro's Number
Whole
Determine the Empirical Formula for a lactic acid that is 40.0% Carbon, 6.71% Hydrogen, and 53.3% Oxygen.
Empirical Formula
CH2O
What is the percent composition of sodium in NaCl? (Round to the nearest whole number)
39%
What is the molar mass of CO2?
44 g/mol
1 mole of a substance will contain 6.02 x1023 _____'s. THIS PROBLEM HAS MORE THAN ONE CORRECT ANSWER. GIVE EACH ANSWER FOR BONUS POINTS!
atoms, molecules, or formula units
True or False: The molecular formula will always be equal to or a multiple of the empirical formula.
True
What is the molecular formula for a compound with an empirical formula of C2OH4 and a molar mass of 44 g/mol.
Molecular Formula:
C2OH4
What is the percent composition of copper in CuBr2? (Round to the tenth of a percent)
28.5%
What is the molar mass of NaOH?
40 g/mol
I want to convert atoms to moles. My friend tells me to multiply the number of atoms by 6.02 × 1023 atoms/mole. Is my friend correct?
No, you need to divide
Approximately what percent of gum is comprised of sugar?
a) 25% b) 50% c) 75% d) 100%
b) 50%
Find the molecular formula for a compound with an empirical formula of CFBrO and a molar mass of 254.7 g/mol.
Molecular Formula:
C2F2Br2O2
What is the percent composition of bromine in CuBr2? (Round to the tenth of a percent)
71.5%
What is the molar mass of CaBr2?
200 g/mol
How many atoms are in 2 moles of Na?
12.04*1023
How do Br, I, N, Cl, H, O, & F exist in nature? (Hint: what would there molecular formula be?)
As diatomic molecules!
Br2, I2, N2, Cl2, H2, O2, & F2
What are the empirical and molecular formulas of a compound containing 65.5% C, 5.5% H, and 29.0% O, and has a molar mass of 110 grams/mole?
This problem is worth 1000 points (all or nothing!)
Empirical Formula: C3H3O
Molecular Formula: C6H6O2
What is the percent composition of oxygen in NaOH? (Round to the nearest whole number)
40%
What is the molar mass of (NH4)2S?
68 g/mol
How many moles are in 18.06*1023 atoms of NaCl?
3 moles