Sig Figs and Metric Conversions and Scientific Notation
When multiplying and dividing, the fewest _________ should be used for rounding the final answer.
Significant Figures
What is the equation for Molarity?
Molarity = Moles of Solute / Liters of Solution
What is the molar mass of Helium (He)?
4.003 g/mol
What do you have to calculate for a substance when you convert between moles and grams?
The molar mass
How many significant figures are in 0.042020?
5 Significant Figures
Determine the Molarity of a solution containing 1.50 mols of CaCl2 in 3.00L of solution.
0.500M
True or False: 1 mole of Helium has the same number of atoms as 1 mole of Nitrogen.
True
How many moles are in 95 g of KCl?
Molar Mass of KCl = 74.55 g/mol
1.3 Moles
Convert 234mL into L
0.234 L
Determine the molarity of a solution containing 0.250 moles of calcium chloride in 750 mL of solution.
0.33M
True or False: 1 mole of potassium (K) has a different mass than 1 mole of copper (Cu).
True
How many grams are in 1.5 moles of AgCl?
Molar Mass of AgCl = 143.32 g/mol
210 g
Provided the final answer to the correct precision according to our sig fig rules.
12.5 moles x 122.10 g/moles =
1530 g
How many moles of NaC2H3O2 would be needed to make 1.5L of a 0.50M solution?
0.75 moles
Calculate the molar mass of (NH4)2CO3.
96.094 g/mol
How many moles are in 128 g of NaCl?
Hint: Solve this first!!! Molar Mass of NaCl = _______ g/mol
2.19 moles
Convert 56,000,000 into scientific notation.
5.6 x 107
How many moles of CaCl2 would be needed to make 600mL of a 0.5M solution?
0.3 moles
Calculate the molar mass of Cr2(SO4)3.
392.21 g/mol
How many grams are in 2.35 moles of Mg(NO3)2?
Hint: Solve this first!!! Molar Mass of Mg(NO3)2 = _______ g/mol
349 g
Convert 35m into mm.
35000mm
You are trying to make a 3.5M solution of HCl with 5.0 moles of acid available. What volume of the solution will you be able to make?
1.4 L
6.02 x 1023 atoms of calcium would have what mass?
40.08 g
How many molecules are in 1.35 moles of H2O?
8.13 x 1023 molecules