Loren has the samples of elements that are listed below at room temperature. He exposes the samples to the same heat source until each sample reaches a temperature of 90.0°C. 10 g of Al(s) ( = 0.897 J/(g°C)) 10 g of Ag(s) (= 0.234 J/gi°C ) 10 g of Fe(s) ( = 0.450 J/gi°C) 10 g of Zn(s) ( = 0.387 J/g°C ) From first to last, which lists the order in which these samples will reach 90.0°C?

Ag>Zn>Fe>Al

Explanation:

Step 1: Data given

Final temperature = 90.0 °C

10 g of Al(s) ( = 0.897 J/(g°C))

10 g of Ag(s) (= 0.234 J/g°C )

10 g of Fe(s) ( = 0.450 J/g°C)

10 g of Zn(s) ( = 0.387 J/g°C )

Suppose the initial temperature is 0 °C

Step 2: Calculate the heat needed to heat

Q = m*C*ΔT

⇒with Q = the heat needed to heat  the elements

⇒with m = the mass of the sample = since the mass is the same for each sample, this will not affect

⇒with c = the specific heat of the sample = the heat needed to raise 1 gram of the sample 1°C

⇒ΔT = the change of temperature = since all of the sample have the same initial and final temperature, this will not affect.

The sample with the lowest specific heat capacity will reach 90.0 °C the first

10 g of Ag(s) will heat the fastest

10 g of Zn(s)

10 g of Fe(s)

10 g of Al(s)

Ag>Zn>Fe>Al

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considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.