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(help!!)MOLAR MASS Calculate the molar mass of the following chemical formula; 324423 MOLE


1. CCl2 F    3. (NH)SO2. H3 PO     4. Ga(SO)


A. Using mole ratio, convert each of the following grams to moles. 
1. 25.0 g  C7H6O2     3. 47.2 g SO
2. 180.0 g Ca(OH)2   4. 48.7 g SrCO3  

 

B. Using mole ratio, convert each of the following moles to grams. 
1. 11.5 moles N2O4    3. 6.2 moles Ca3(PO4)2  
2. 10.65 moles H3PO4    4. 0.5 moles S2O3  

 

AVOGADRO'S NUMBER 
1. How many moles of magnesium are there in a 3.01x1022 atoms of magnesium?  
2. How many molecules are there in 4.00 moles of glucose, C6H12O6?  
3. How many moles are there in 1.20x1025 formula units of Calcium iodide?  
4. How many oxygen molecules are present in 3.3 g of Oxygen (O2) 
5. Find the mass in grams of 1.00x1023 molecules of N2
 

PERCENT COMPOSITION
Find the percent composition of all the elements in the following compounds; 
1. CuBr            3. (NH4)2
2. Mg(NO3)2     4. Al2(SO4) 
 

EMPIRICAL FORMULA
1. What is the empirical formula for a compound which contains 0.0134 g of iron, 0.00769 g of sulfur and 0.0115 g of oxygen? 
2. Find the empirical formula for a compound which contains 32.8% chromium and 67.2% chlorine. 
 

MOLECULAR FORMULA 
1. What is the empirical formula of a compound phosphorous and oxygen was found to be P2O5. Experimentation shows that the molar mass of this compound is 238.89 g/mol. What is the compounds molecular formula? 
2. The empirical formula for trichloroisocyanuric acid, the active ingredient in many household bleaches, OCNCl. The molar mass of this compound is 232. 4 g/mol. What is the molecular formula of trichloroisocyanuric acid? 

 

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