Of course, at STP, dioxygen is a gas, but 10.0 g is still 10.0 g. We could calculate its volume at STP, which is 22.4 L × its molar quantity, approx. 8⋅L . There are 1.51×1023molecules O2 in 10.0 g O2 .
Answer:
change of color
Explanation:
when a substance undergoes a change of color it is an indication that it was chemical
Explanation:
The given data is as follows.
mass = 0.158 g, volume = 100 ml
Molarity = 1.0 M, =
The given reaction is as follows.
So, moles of magnesium will be calculated as follows.
No. of moles =
=
=
= 0.0065 mol
Now, formula for heat released is as follows.
Q =
=
=
= 3010.32 J
Hence, heat of reaction will be calculated as follows.
=
= -4.63 J/mol
or, = (as 1 kJ = 1000 J)
Thus, we can conclude that heat of given reaction is kJ/mol.
Answer: 0.45 J / g °C
Explanation: solution attached.
Heat is equal to the product of mass, specific heat and change in temperature.
Q= mc∆T
Derive the equation to find c
c = Q / m∆T substitute the values
c = 21.6 J / 2.0g ( 24°C - 5°C)
c = 0.45 J / g ° C
Answer:
a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.
Explanation: