Explanations 
Textbooks 
Exams 
GCSE 
IGCSE 
AS 
A Level 
International A Level 
University Admissions Tests 
Flashcards 
Vaia AI 
Notes 
Study Plans 
Study Sets 
Find a job 
Find a degree 
Student Deals 
Magazine 
Mobile App Problem 54
Calculate the moles of \(\mathrm{H}_{2} \mathrm{O}\) vapours formed if \(1.57\) mole of \(\mathrm{O}_{2}\) are used in presence of excess of \(\mathrm{H}_{2}\) for the given change, $$ 2 \mathrm{H}_{2}+\mathrm{O}_{2} \longrightarrow 2 \mathrm{H}_{2} \mathrm{O} $$
Problem 55
Potassium bromide \(\mathrm{KBr}\) contains \(32.9 \%\) by mass potassium. If \(6.40 \mathrm{~g}\) of bromine reacts with \(3.60 \mathrm{~g}\) of potassium, calculate the number of moles of potassium which combine with bromine to form \(\mathrm{KBr}\).
Problem 56
Zinc and hydrochloric acid react according to the reaction : $$ \mathrm{Zn}(\mathrm{s})+2 \mathrm{HCl}(\mathrm{aq} .) \longrightarrow \mathrm{ZnCl}_{2}(\mathrm{aq} .)+\mathrm{H}_{2}(\mathrm{~g}) $$ If \(0.30\) mole of \(\mathrm{Zn}\) are added to hydrochloric acid containing \(0.52\) mole HCl, how many moles of \(\mathrm{H}_{2}\) are produced?
Problem 57
A mixture of \(1.0\) mole of \(\mathrm{Al}\) and \(3.0\) mole of \(\mathrm{Cl}_{2}\) are allowed to react as: $$ 2 \mathrm{Al}_{(\mathrm{s})}+3 \mathrm{Cl}_{2} \longrightarrow 2 \mathrm{AlCl}_{3(\mathrm{~s})} $$ (a) Which is limiting reagent? (b) How many moles of \(\mathrm{AlCl}_{3}\) are formed? (c) Moles of excess reagent left unreacted.
Problem 58
\(23 \mathrm{~g}\) sodium metal reacts with water. Calculate the : (a) volume of \(\mathrm{H}_{2}\) liberated at NTP, (b) moles of \(\mathrm{H}_{2}\) liberated, (c) weight of \(\mathrm{H}_{2}\) liberated.
Problem 60
For the reaction ; $$ 2 \mathrm{Na}_{3} \mathrm{PO}_{4(\mathrm{aq})}+3 \mathrm{Ba}\left(\mathrm{NO}_{3}\right)_{2(\mathrm{aq})} \longrightarrow \mathrm{Ba}_{3}\left(\mathrm{PO}_{4}\right)_{2(\mathrm{~s})}+6 \mathrm{NaNO}_{3(\mathrm{aq})} $$ Suppose that a solution containing \(32.8 \mathrm{~g}\) of \(\mathrm{Na}_{3} \mathrm{PO}_{4}\) and \(26.1 \mathrm{~g}\) of \(\mathrm{Ba}\left(\mathrm{NO}_{3}\right)_{2}\) is mixed. How many \(\mathrm{g}\) of \(\mathrm{Ba}_{3}\left(\mathrm{PO}_{4}\right)_{2}\) are formed?
Problem 61
Cialculate the weight of lime (CaO) obtained by heating \(300 \mathrm{~kg}\) of \(90 \%\) pure limestone \(\left(\mathrm{CaCO}_{3}\right)\).
Problem 68
Calculate the percentage composition in terms of mass of a solution obtained by mixing \(300 \mathrm{~g}\) of a \(25 \%\) and \(400 \mathrm{~g}\) of a \(40 \%\) solution by mass.
Problem 70
A gaseous alkane on complete combustion gives \(\mathrm{CO}_{2}\) and \(\mathrm{H}_{2} \mathrm{O}\). If the ratio of moles of \(\mathrm{O}_{2}\) needed for combustion and moles of \(\mathrm{CO}_{2}\) formed is \(5: 3\) find out the formula of alkane.
Problem 71
Find the milli-cquivalent of : (a) \(\mathrm{Ca}(\mathrm{OH})_{2}\) in \(111 \mathrm{~g}\). (b) \(\mathrm{NaOH}\) in \(30 \mathrm{~g}\), (c) \(\mathrm{H}_{2} \mathrm{SO}_{4}\) in \(4.9 \mathrm{~g}\).
