A cylinder containing 14.68 L of helium gas at a pressure of 169.3 atm is to be used to fill toy balloons to a pressure of 1.071
atm. Each inflated balloon has a volume of 2.429 L. What is the maximum number of balloons that can be inflated? Report your answer to 1 decimal place. (Remember that 14.68 L of helium at 1.071 atm will remain in the exhausted (empty) cylinder)
1 answer:
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Answer is: beryllium-10.
The diagram shows that atom has 4 protons, 5 neutrons and 2 valence electrons.
Atomic number is the number of protons, which is characteristic of a chemical element, beryllium (Be) is an element with atomic number 4.
Two valence electrons means that atom is from 2. group of periodic table, only beryllium is from that group; sodium (1. group), boron (13. group) and carbon (14. group).
Beryllium-10 has 6 neutrons, so it is isotope (different number of neutrons or mass number).
