Answer:
0.45 moles of air are in a 3.0 L balloon
Explanation:
The given problem can be solved by using unitary method.
Firstly, we have to find out how many breaths are equivalent to 3.0 L. Secondly, we have to find out how many moles of air are supplied corresponding to the calculated number of breaths.
1.2 L = 3 breaths
So, 3.0 L = 
breaths = 7.5 breaths
1 breath supplies 0.060 moles of air
So, 7.5 breaths supplies 
moles of air or 0.45 moles of air.
Hence, 0.45 moles of air are in a 3.0 L balloon.
You're answer would be 25,190
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Answer: 1.2 Moles of Nickel
Explanation:
So you have to transfer grams to moles.
You do this by dividing your beginning mass by the atomic mass of the element (found on the periodic table).
1 mole is equal to the atomic mass of the element. The atomic mass of Nickel is 58.6934 rounded to the proper significant figures will be 59.
72 Grams Nickel / 59 grams = 1.2 moles of Nickel
Answer: B) 2+
Explanation:
There are exactly 2.54 centimeters in an inch, the closest option is:
B) 2+
