The balanced equation is
<span>Zn + 2 AgNO3 = Zn(NO3)2 + 2 Ag </span>
<span>the ratio between Zn and AgNO3 is 1 : 2 </span>
<span>moles AgNO3 required = 5.7 x 2 =11.4 </span>
<span>we have only 8.9 moles of AgNO3 so it is the limiting reactant </span>
<span>moles Zn needed = 8.9/2=4.45 </span>
<span>moles Zn in excess = 5.7 - 4.45 =1.25 ( or 1.3 at two significant figures)
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Answer:
Which expression is equivalent to 5(4x+3)-2x?a 18x+15b 18x+3c 7x+8d 2x+8
A-18x+15
3(2-b)<10-3(b-6)
6-b<5(b-6)
6-b<5b-30
Let's make "b".......2
6-(2)<5(2)-30
4<10-30
4<-20
In this case, this is a false statement. You can make "b" any number and I chose 2. I hope this helped!
Answer:
0.125 seconds.
Step-by-step explanation:
We have been given that the height of a ball above the ground as a function of time is given by the function
, where h is the height of the ball in feet and t is the time in seconds.
We can see that our given equation is a downward opening parabola as its leading coefficient is negative. The maximum point will be vertex of parabola.
To find the time, when the ball would be at its maximum height, we need to find the x-coordinate of vertex.
Using formula
, we will find the x-coordinate of vertex of parabola as:





Therefore, the ball will be at a maximum height after 0.125 seconds.
Answer:
300 %
Step-by-step explanation:
Length of the larger cube =4 cm
So volume 
Length of the smaller cube = 1 cm
Volume of the smaller cube 
So total number of smaller cube 
Surface area of the larger cube 
Surface area of the 64 smaller cube 
So percentage increase in surface area
%