It could be Ne(Neon) or Ar(Argon) but the difference between both of them is that they are in different period Neon is in the 2 period and Argon is in 3 period
Moles of helium is required to blow up a balloon to 87.1 liters at 74 C and 3.5 atm is 021.65 mole
Mole is the unit of amount of substances of specified elementary entities
According to the ideal gas law he number of moles of a gas n can be calculated knowing the partial pressure of a gas p in a container with a volume V at an absolute temperature T from the equation
n =pV/RT
Here given data is volume = 87.1 liters
Temperature = 74 °C means 347.15 k
Pressure = 3.5 atm
R = 0.0821
Putting this value in ideal gas equation then
n =pV/RT
n = 3.5 atm×87.1 liters / 0.0821 ×347.15 k
n = 021.65 mole
Moles of helium is required to blow up a balloon to 87.1 liters at 74 C and 3.5 atm is 021.65 mole
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Given the number of Mg atoms is 
We know that 1 mol of any substance has Avogadro number 
of formula units.
Converting number of atoms to mol:
Converting mol to mass of Mg:
Therefore mass of Mg is <u>2.99 g</u>
Bc it waters the plants that provide for the fish
