Molar Mass
H2
2.016
How many moles of sodium (Na) are in 46.0 grams of sodium?- 4 decimals
2.0008
How many atoms of helium (He) are in 2.00 moles of helium?
1.2 x 10^24 atoms of He
A compound is 40.0% carbon and 6.7% hydrogen by mass. The remaining percentage is oxygen. What is the empirical formula?
CH2O
How many atoms of Mg are in 12.0 grams of magnesium?
2.98 x 10^23 atoms of Mg
NaC
35.001
How many moles of water (H2O) are in 36.0 grams of water?-3 decimals
1.998
How many atoms of aluminum are in 0.750 moles of Al?
4.52 x 10^23 atoms of Al
A compound contains 52.2% carbom, 13.0% hydrogen, and 34.8% oxygen. What is the empirical formula?
C2H6O
What is the mass of 3.01 x 10^23 atoms of Carbon?
6 grams of carbon
AlBr3
186.79
How many moles of calcium carbonate (CaCO3) are present in 250.0 grams of CaCO3?-3 decimals
2.497
How many oxygen atoms are in 0.500 moles of H2O?
3.01 x 10^23 oxygen atoms
A compound is composed of 27.3% carbon 72.7% oxygen. What is the empirical formula?
CO2
How many molecules of water (H2O) are in 18 grams of water?
6.02 x 10^23 molecules of H2O
CuSO4
159.608
How many moles of sodium chloride (NaCl) are in 58.5 grams of NaCl? Round to the nearest whole number.
1
How many molecules of CO2 are in 1.25 moles of CO2?
7.53 x 10^23 molecules of CO2
A compound contains 4.8g carbon, 0.8g hydrogen, and 6.4g oxygen. What is the empirical formula?
CH2O
What is the mass of 6.02 x 10^23 molecules of carbon dioxide (CO2)?
44g of CO2
K3PO4
212.264
A mixture has a mass of 100 grams and is 20.0% calcium carbonate (CaCO3) by mass. How many moles of CaCO3 are in the mixture?-2 decimals
0.19
How many oxygen atoms are present in 0.250 moles of carbon dioxide(CO2)?
3.01 x 10^23 oxygen atoms
A compound contains 56.4% nitrogen and 43.6% oxygen by mass. What is the empirical formula?
N3O2
How many oxygen atoms are present in 44 grams of carbon dioxide?
1.2 x 10^24 oxygen atoms