Scientific Notation
Which of these numbers is the largest?
2.5*104 or 4.7*103 or 9000
2.5*104
What is the molar mass of MgBr2?
Answer should be properly rounded to 2 decimal places.
184.11 g
If you have 0.0052 moles of carbon, how many carbon atoms do you have?
Answer should have the right number of sig figs.3.1 * 1021 atoms
Which of these numbers is the largest?
0.00030 or 5.2*10-5 or 1.9*10-3
1.9*10-3
What is the molar mass of Al(NO2)3?
Answer should be properly rounded to 2 decimal places.
165.01 g
How many moles of lithium are in a 30.0 g sample of it?
Answer should have the right number of sig figs.
4.32 moles
Write this number in scientific notation.
Your answer should have the same number of sig figs!
250,000,000,000
2.5 * 1011
What is the molar mass of calcium chloride?
Answer should be properly rounded to 2 decimal places.
CaCl2
110.98 g
If you have 0.500 moles of MgI2, how many grams do you have?
139 g
Write this number in scientific notation.
Your answer should have the same number of sig figs!
0.00070
7.0 * 10-4
What is the molar mass of ammonium oxide?
Answer should be properly rounded to 2 decimal places.
(NH4)2O
52.10 g
How many atoms are in a 7.0 g sample of boron?
3.9 * 1023 atoms
Write this number in standard notation.
Your answer should have the same number of sig figs!
9.8*1012
9,800,000,000,000
What is the molar mass of beryllium phosphate?
Answer should be properly rounded to 2 decimal places.
Be3(PO4)2:
216.97 g
What is the mass of a sample that contains 2.000*1020 molecules of H2O?
Answer should have the right number of sig figs.
0.005985 g