Answer:
76
Explanation:
Alpha decay is one of the most basic forms of radioactive decay. It has an atomic mass of 4 and a proton number of two.
Undergoing an alpha decay will decrease the atomic mass by four and the atomic number by two.
In this particular question, we are particular about the atomic number. The atom has an atomic number of 78. So taking 2 off this gives 76
Answer:
The correct answer is option false.
Explanation:
Molality of the solution defined as moles of substance present in 1 kilogram of solvent.
Moles =
Mass of percent (w/w%) of the solution is defined as amount of solute present in 100 grams of solution.
So, if want to inter-convert molality into mass percent we can do that without knowing density of solution.
Mass of solution = Mass of solute + Mass of solvent
Answer is 1.67 moles of glucose.
<em>Explanation :</em>
With the presence of oxygen glucose produces CO₂ and H₂O.
The balanced equation is
C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(l)
The stoichiometric ratio between C₆H₁₂O₆(s) and 6O₂(g) is 1 : 6.
Hence,
moles of C₆H₁₂O₆(s) reacted = moles of reacted O₂(g) / 6
= 10.0 mol / 6
= 1.67 mol
Water, food, shelter, oxygen, a steady temperature.
here's five, just pick 4, good luck :)