Answer:
Explanation
we know that
Δ H= m C ΔT
where
ΔH = change in enthalpy (j)
m=mass of the given substance which in this case is water
C= specific heat capacity
ΔT=change in temperature
we know that given mass of water =29.6 g
and ΔT=T2-T1=125-(-55)=180
specific heat capacity of water is 4.18 j/g °C
therefore ΔH= 29.6 g*4.18 j/g °C* 180 °C
so ΔH=22271.04 j
Oxygen and sodium are the only ones that are elements here example like the others air is a mixture of a compound and an element
1.) N3Cl
2.) Ionic because Cs is a metal and PO4 is a nonmetal
a) The E might belong to group 13.
As the formula of a chemical compound is derived by the cross multiplication of the valency of the atoms. As formula of the given oxide is and valency of O atom is -2, therefore valency of element E must be +3 in order to obtain E2O3.
Also, in EF3, the valency of E will be +3 because there are three atoms of fluorine who has an individual valency of -1. Thus, e will have the valency of +3.
The Group 13 is the boron group which has the following elements:
- Boron
- Aluminium
- Gallium
- Indium
- Thallium
All these elements have the valency of +3.
To know more about Valency, refer to this link:
brainly.com/question/12717954
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