atoms of Iron Weigh As Much As 1cc Of H2 at S.T.P. What Is The Atomic Mass Of Iron?

What volume of oxygen gas (O₂) measured at 0^oC and 1 atm is needed to burn completely 1 L of propane gas (C₃H₈) messured under the same conditions?

An organic compound contains carbon, hydrogen and oxygen. Its chemical analysis gave C, 38.71 % and H, 9.67%. The empirical formula of the compound would be  

How many moles of lead (II)chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl? 

0.1 mole of a carbohydrate with empirical formula CH₂O contains 1 g of hydrogen. What is its molecular formula? 

The percentage of an element M is 53 in its oxide of molecular formula M₂O₃. Its atomic mass is about

80 g of oxygen contain as many atoms as in 

A black dot used as a full stop at the end of a sentence has a mass of about one attogram. Assuming that the dot is made up of carbon, calculate the approximate number of carbon atoms presents in the dot?  

Insulin contains 3.4% sulphur. Calculate the minimum molecular mass of insulin.

4 g carbon were heated with 8 g of sulphur. How much carbon disulphide (CS₂) will be formed when the reaction is completed? What will be its percentage purity?  

How many years would it take to spend Avogadro’s number of rupees at the rate of 10 lakh rupees per second?