How many moles of nitrogen dioxide are present in  3.36 x 10^21 molecules of this compound?  _____ moles How many molecules of nitrogen dioxide are present in 4.61 moles of this compound? ______ molecules   1. How many moles of phosphate ions are present in a sample that contains 3.02 moles of manganese(II) phosphate, Mn3(PO4)2? ________ moles PO43- 2. How many moles of Mn3(PO4)2 are present in a sample that contains 5.08 moles of phosphate ions? ________ moles

Ethanol has a molecular formula of CH3CH2OH. 1.) What is the molar mass of ethanol? 2.) What is the mass of 0.562 moles of ethanol? 3.) How many moles of ethanol are present in a 100.0 g sample of ethanol? 4.) How many moles of each element (C, H, O) are present in a 100.0 g sample of ethanol? 5.) How many grams of each element (C, H, O) are present in a 100.0 g sample of ethanol?

How many atoms are present in 123 g of sodium cyanide (cyanide = CN-)?     A sample contains 0.687 mol H3PO3. What is the mass of H3PO3in the sample?     A 2.000 g sample of Calcium sulfate dihydrate, CaSO42H2O (this is one molecule) contains 1.582 g CaSO4. How many moles of CaSO4 are there in this sample? Assuming that the rest of the sample is water, how many moles of H2O are there in the sample? How is the result consistent with the formula CaSO4·2H2O?

2

1. Calculate the number of moles of chlorine in 2.34 x 1019 molecules of chlorine. 2. Calculate the number of molecules of water in a 500.0-mL glass of water. (Note: assume density of water is 1.000 g/mL) 3. Calculate the number of moles of carbon atoms in 50.0 g CS2. 4. Calculate the molar mass of potassium carbonate, K2CO3.

Calculate the number of moles of aluminum, sulfur, and oxygen atoms in 6.00 moles of aluminum sulfate, Al2 (SO4)3. Express the number of moles of Al, S, and O atoms numerically, separated by commas. Calculate the number of moles of magnesium, chlorine, and oxygen atoms in 2.20 moles of magnesium perchlorate, Mg(ClO4)2. Express the number of moles of Mg, Cl, and O atoms numerically, separated by commas. A sample of propane, C3 H8, contains 16.3 moles of carbon atoms. How many total moles of atoms does the sample contain? Express the total number of moles of carbon and hydrogen numerically.

8. How many moles of magnesium is 3.01 x 102² atoms of magnesium? 9. How many molecules are there in 4.00 moles of glucose, CeH12Oe? 10. Calculate the formula mass of ammonium sulfate fertilizer. 11. How many grams are in 7.20 mol of dinitrogen trioxide? 12. A sample of an element osmium (Os) weighs 400 grams. Calculate the number of osmium atoms in the sample.

A.How many molecules of nitrogen trifluoride are present in 2.13 moles of this compound?   B.How many moles of nitrogen trifluoride are present in 1.50 x 10^22 molecules of this compound?

1. How many MOLECULES of dinitrogen tetroxide are present in 4.82 moles of this compound ? molecules. 2. How many MOLES of dinitrogen tetroxide are present in 9.71×102² molecules of this compound ? moles.

1.00 mole of copper(II) sulfate, CuSO4, contains how many O atoms? O 2.41 x 1023 O atoms 2.41 x 1024 O atoms O 6.02 x 1023 O atoms O 1.51 x 1023 O atoms