80 G Of Oxygen Contain As Many Atoms As In 

The crystalline salt Na₂SO₄.xH₂O on heating losses 55.9% of its weight. The formula of the crystalline salt is 

10 litres of O₂ gas is reacted with 30 litres of CO at STP. The volume of each gas present at the end of the reaction are

0.3 g of an acid is neutralised by 40 cm³ of 0.125 N NaOH. Equivalent mass of the acid is 

Volume occupied by one molecule of water (density = 1 g cm^–3)is

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

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?