Driving to work one morning, you get a flat tire. When using the car jack, you apply 120 N of force to the jack and the jack in
1 answer:
16.7
Explanation:
Given parameters:
Force applied to Jack = 120N
Force produced by Jack = 2000N
Unknown:
Mechanical advantage of jack = ?
Solution:
Mechanical advantage is the ratio of force produced by the device and the force applied on it.
It is used to access the performance of a machine.
M.A = \frac{force output}{force input}
Now input the parameters;
M.A =
M.A = 16.7
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Answer:- 448 mL of hydrogen gas are formed.
Solution:- It asks to calculate the volume of hydrogen gas formed in milliliters at STP when 0.020 moles of magnesium reacts with excess HCl acid. The balanced equation is:
There is 1:1 mol ratio between Mg and hydrogen gas. So, the moles of hydrogen gas is also equals to the moles of Mg reacted.
moles of Hydrogen gas formed = 0.020 mol
At STP, volume of 1 mol of the gas is 22.4 L. We need to calculate the volume of 0.02 moles of hydrogen gas.
= 0.448 L
They want answer in mL. So, let's convert L to mL using the conversion formula, 1L = 1000mL
= 448 mL
So, 0.020 moles of magnesium would produce 448 mL of hydrogen gas at STP on reacting with excess of HCl acid.