80 g of oxygen contain as many atoms as in
5 g of hydrogen
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 0oC 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?