Answer:
719.83°C
Explanation:
The heat that the sample of Zinc gives is equal to the heat that water is absorbing. That is:
C(Zn) * m(Zn) * ΔT(Zn) = C(H2O) * m(H2O) * ΔT(H2O)
<em>Where:</em>
<em>C is specific heat (Zn: 0.390J/g°C; H2O: 4.184J/g°C)</em>
<em>m is mass (Zn: 2.50g; H2O: 65.0g)</em>
<em>ΔT (Zn: ?; H2O: (22.5°C - 20.0°C = 2.50°C)</em>
<em />
Replacing:
0.390J/g°C * 2.50g * ΔT(Zn) = 4.184J/g°C * 65.0g * 2.50
ΔT(Zn) = 697.33°C
As final temperature of Zn is 22.50°C, initial temperature is:
Initial temperature: 697.33°C + 22.50°C
719.83°C
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<span>Dissolution is the process of dissolving a solute in a solvent. I think the correct answer is B. Increasing the pressure of the solution will not affect the rate of dissolution given a solid solute since solid is non-compressible thus it is not affected that much with pressure. Also, known factors of dissolution are temperature, surface area and mixing rate.</span>
Answer:When a lithium atom forms an Li+ ion, the lithium atom (1) gains a proton (2) gains an electron (3) loses a proton (4) loses an electron
Answer:
RbI
Explanation:
The formula of a compound can be obtained on the basis of number of anion and cations in the unit cell. Iodide is present at the eight corners of the cubic cell.
So, no. of iodide ion = 1/8×8= 1
rubidium is present at the center
so, no. of rubidium ion = 1×1 =1
Therefore formula of the compound = RbI