Sig Figs
How many significant figures does this number have?
32.380
5 significant figures
Write the following number in scientific notation with unit.
62,400,000,000,000 s
6.24 x 1013 s
What is the molar mass of O2? (Round to 2 decimal places and include the correct unit.)
32.00 g/mol
How many moles are there in 48.3 grams of Aluminum? (Apply correct significant figures and units in your answer.)
1.79 moles
What is the name of this hydrate: LiClO4 • 3H2O
Lithium perchlorate trihydrate
How many significant figures does this measurement have?
5,900,023 cm
7 significant figures
Write the following number in scientific notation with unit.
0.000000327 km
3.27 x 10-7
What is the molar mass of sodium nitride? (Round all molar masses to 2 decimal places. Report final answer with 2 decimal places and correct unit.)
82.98 g/mol
How many grams is 4.97 moles of hydrofluoric acid? (Apply correct significant figures and units in your answer.)
99.4 grams
Iron (III) chloride hexahydrate
FeCl3•6 H2O
How many significant figures does this number have?
0.00394
3 significant figures
Write the following number in long form (regular form) with unit.
9.47 x 105 g
947000
What is the molar mass of sodium carbonate ? (Round all molar masses to 2 decimal places. Report final answer with 2 decimal places and correct unit.)
105.99 g/mol
How many atoms are there in 1.85 moles of sodium? (Apply correct significant figures and units in your answer.)
1.11 x 1024 atoms
A 48.72g sample of an unknown substance was analyzed in the lab. It was found to contain 32.69g of zinc and 16.03 g of sulfur. Determine the percent by mass of Zn. (Determine final answer with 2 decimal places.)
67.10%
Answer the following question using correct significant figures and units.
7.592m x 8.2m
62m2
Answer the following question in correct scientific notation.
(2.480 x 106 mm) x (3.96 x 105 mm2) =
9.82 x 1011 mm3
What is the molar mass of diphosphorous trinitride ? (Round all molar masses to 2 decimal places. Report final answer with 2 decimal places and correct unit.)
103.97 g/mol
You have 3.97 x 1024 atoms of neon What is the mass of this sample in grams? (Use appropriate sig figs in your answer. Round all molar masses to 2 decimal places.)
133.08 grams
Calculate the percent by mass of P in calcium phosphite, Ca3(PO3)2. (Report your percent with 2 decimal places.)
22.27%
Answer the following question using correct significant figures.
7.592 mL + 8.2mL
15.8 mL
Answer the following question in correct scientific notation.
5.3 x 109 g ÷ 7.32 x 103 L
7.2 x 105g/L
What is the molar mass of aluminum sulfite? (Round all molar masses to 2 decimal places. Report final answer with 2 decimal places and correct unit.)
294.14 g/mol
How many atoms of oxygen are in 24.1g of calcium phosphate, Ca3(PO3)2? (Apply correct significant figures and units in your answer.)
3.13x1023 atoms of O
A hydrate was heated and the following data was collected.
Evaporating dish: 20.00g
Evaporating dish and Hydrate: 24.74 g
Evaporating dish and Anhydrous Sat: 22.58 g
Calculate the percent by mass of water in this hydrate. (Calculate % with two decimal places.)
45.57% by mass of water