Answer:
1) 1.15 mol
2) M=0.45
3) 22.5 mL
4) 6.25 mL
Explanation:
1)
550 mL= 0.55 L
M= mol solute/ L solution
mol solute= M * L solution
mol solute= (2.1 M * 0.55 L ) M=1.15 mol solute
2)
155 mL = 0.155 L
80 g -> 1 mol NH4NO3
5.61 g -> x
x= (5.61 g * 1 mol NH4NO3)/80 g x= 0.07 mol NH4NO3
M=(0.07 mol NH4NO3)/0.155 L M=0.45
3) M1V1=M2V2
V1= M2V2/M1
V1= (0.500 M * 0.225 L)/5.00 M V1=0.0225 L =22.5 mL
4) M1V1=M2V2
V1= M2V2/M1
V1= (0.25 M * 0.45 L)/ 18.0 M
V1=6.25 x 10^-3 L = 6.25 mL
Wood sinks in ethanol => wood has higher density than ethanol.
wood floats in gasoline=> wood has lower density than gasoline
Insects and dogs are both in the Animalia classification.
Answer : The volume of 
gas needed are, 90 L
Explanation : Given,
Volume of 
= 60 L
Now we have to determine the volume of needed.
As we know that at STP, 1 mole of gas contains 22.4 L volume of gas.
The given balanced chemical reaction is:
By the stoichiometry we can say that, 2 moles of react with 3 moles of oxygen gas to give 2 moles of 
gas and 2 moles of water vapor.
From the balanced reaction we conclude that,
As, 
volume of react with 
volume of gas
So, 
volume of react with 
volume of gas
Thus, the volume of gas needed are, 90 L
