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In a village 50% of the villagers produce rice, 40% of the villagers produce apples and 50% of the villagers produce vegetables, 20% of the villagers produce rice and apples both, 25% of the villagers produce apples and vegetables both, 20% of the villagers produce rice and vegetables both and 10% of the villagers produce all three. Find the percentage of villagers who do not produce anything.
10 moles of C6H12 reacted with 18 moles of O2, how many moles of CO2 will produce?
Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2.hr. The equilibrium data is represented by Y = 3X2, where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is
A reactor is supplied with 5 moles of KNO3 and some H2SO4, if the extent of reaction is 2, how many moles of H2SO4 were supplied?
In a village there are 300 people. They produce different crops, out of all people 190 people produce paddy, 160 people produce wheat and 100 people produce both paddy and wheat. Find the number of people who neither produce paddy nor wheat. 
একটি লঘু H2SO4 মিশ্রিত 15 15 cm2 আয়তনের 0.3 M KMnO4 দ্রবণ দ্বারা 25 cm3 অায়তনের H2SO4 কে জারিত করে। এ দ্রবণে H2SO4 এর মোলার ঘন মাত্রা কত হবে?
1000 mL 1 N H2SO4   এর দ্রবণ তৈরি করতে 98% H2SO4   এর কত মিলিলিটারের প্রয়োজন হবে? [H2SO4   এর ঘণত্ব = 1.8 g /cc]
1 mole of potassium permanganate and 1 mole of ferrous sulfide are reacted in presence of excess hydrochloric acid, how many moles of Ferric sulfate will produce?
A reactor is supplied with 6 moles of N2 and 9 moles of H2, if 3 moles of NH3 is produced, how many moles of H2 are left at the end?
10 moles of O2 is added to 10 moles of H2, how many moles of H2O will it produce?