Basically the temperature it would take to boil water which is 100 degrees celcius, the equivalent of 212 degrees farenheight
A mixture is a compound of two or more substances a pure substance is only made of one kind of atom and a solution is composed of a liquid substance made of two or more types of atoms
Then... (What is the other part of the question...?)
An oxygen molecule at 25◦C has a speed of 1520 miles/hour.
<h3>Equation :</h3>
As we know
1 km = 1000 meter
So,
678 / 1000 = 0.678 km
And 1 mile = 1.6 km
So,
0.678 / 1.609 = 0.4213 miles
We know that 1 hour = 60×60 = 3600 sec
So,
1 sec = 1 / 3600
= 2.777 x 10⁻⁴ hour
Now finding speed,
speed = distance / time
speed = 0.4213 / 2.777 x 10⁻⁴
speed = 1520 miles/hour
<h3>What is speed ?</h3>
Velocity is the rate and direction of an object's movement, whereas speed is the time rate at which an object is moving along a path. In other words velocity is a vector value, whereas speed is a scalar value.
To know more about molecule :
brainly.com/question/1446104
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Answer: 10.2 grams
Explanation:
The balanced chemical reaction is :
![CaH_2(s)+2H_2O(l)\rightarrow Ca(OH)_2(aq)+2H_2(g)](https://tex.z-dn.net/?f=CaH_2%28s%29%2B2H_2O%28l%29%5Crightarrow%20Ca%28OH%29_2%28aq%29%2B2H_2%28g%29)
According to the ideal gas equation:
![PV=nRT](https://tex.z-dn.net/?f=PV%3DnRT)
P = Pressure of the gas = 740 torr = 0.97 atm (760torr=1atm)
V= Volume of the gas = 12.0 L
T= Temperature of the gas = 19°C = 292 K ![0^0C=273K](https://tex.z-dn.net/?f=0%5E0C%3D273K)
R= Gas constant = 0.0821 atmL/K mol
n= moles of gas
![n=\frac{PV}{RT}=\frac{0.97\times 12.0}{0.0821\times 292}](https://tex.z-dn.net/?f=n%3D%5Cfrac%7BPV%7D%7BRT%7D%3D%5Cfrac%7B0.97%5Ctimes%2012.0%7D%7B0.0821%5Ctimes%20292%7D)
![n=0.48](https://tex.z-dn.net/?f=n%3D0.48)
According to stoichiometry:
2 moles of hydrogen are generated by = 1 mole of ![CaH_2](https://tex.z-dn.net/?f=CaH_2)
Thus 0.48 moles of hydrogen are generated by =
moles of ![CaH_2](https://tex.z-dn.net/?f=CaH_2)
Mass of ![CaH_2=moles\times {\text {Molar mass}}=0.24mol\times 42g/mol=10.2g](https://tex.z-dn.net/?f=CaH_2%3Dmoles%5Ctimes%20%7B%5Ctext%20%7BMolar%20mass%7D%7D%3D0.24mol%5Ctimes%2042g%2Fmol%3D10.2g)
Thus 10.2 grams of
are needed to generate 12.0 L of hydrogen gas if the pressure of hydrogen is 740. torr at 19°C