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?
1 mole of PbO reacts with two moles of HCl
Thus, PbO is the limiting reactant.
1 mole of PbO produces 1 mole of PbCl2
= 0.029 mole
Calculate the molar mass of water if it contains 50% heavy water (D2O).
An element X has the following isotopic composition:
200X : 90%
199X : 8.0%
202X : 2.0%
The weight average atomic mass of the naturally occurring element X is closest to :
In the reaction,
2 Al(s) + 6 HCl (aq) → 2 Al3+(aq) + 6 Cl– (aq) + 3 H2 (g)
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
0.1 mole of a carbohydrate with empirical formula CH2O contains 1 g of hydrogen. What is its molecular formula?