Question 20. Please Natural Radioactivity Effects of Radiation: - When radiation

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Question 20. Please Natural Radioactivity Effects of Radiation: - When radiation strikes Medic passes through the huma used in H,0 can cause undesirable ch 20. Use the following balanced equation to answer question a & b. Ca(NO3)2 + Na,so, caso, + 2NaNO3 a) How many moles of NaNO, can be produced from 150.0 grams of Na:SO? b) How many grams of Na:SO, are needed to completely react with 2.0 moles of Ca(NO3)2 clear Reactions What type of radiation can easily be stopped by your skin or your clothing? What radiation requires a few millimeters of aluminym metal to stay protected? What metal can stop gamma rays? Use the following nuclear symbols to complete the nuclear equations. Positron Gamma Beta Alpha He 2. a. Write the equation that shows how Uranium-238 decays by alpha emission. A38 b. Write the equation that shows how Thorium-231 decays by beta emissio

Explanation / Answer

20. Ca(NO3)2 + NaSO4 -à CaSO4 + 2NaNO3

a) 1 mole of Na2SO4 gives two moles of NaNO3

150 gm Na2SO4 means 150g/142gmol-1 = 1.06 mole

Thus 2.12 mol of NaNO3 is produced i.e., 2.12mol/84.99gmol-1 = 180.18 g

b) From the given equation it shows that 1 mole of Na2SO4 is needed to react with 1 moles of Ca(NO3)2

Hence, 2 moles of Na2SO4 is needed to completely react with 2 moles of Ca(NO3)2 .

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