Question

if a piece of 4moles of lithium is dropped into 72g of water then a) 2 moles of lithium unreacted. b) 2 moles of water unreacted. c) 2.5 moles of lithium unreacted​

Answer 1

Reaction is...

2Li+2H2O----->2LiOH+H2

• Here we can see that 2 moles of Lithium reacts with 2 moles of Water

• In the ques.
• 4 moles of lithium is reacting with (72/18 = 4) moles

• THEREFORE WHOLE OF LITHIUM AND WATER WOULD BE CONSUMED..