Given,
The two isotopes of B are 10B and 11B
% abundance of 10B = 19.80
% abundance of 11B = 80.20
Average atomic mass of B
= 
= 
= 
= 
= 10.802
Therefore, the average atomic mass of B is 10.802 u
Answer:
Propane gas plus oxygen gas produces water and carbon dioxide.
Explanation:
This is the initial chemical equation: C3H8 + O2 = CO2 + H2O
This is the balanced chemical equation: C3H8 + 5 O2 = 3 CO2 + 4 H2O
B is the answer. hope this helps
Explanation:
The danger zone is= that people within the danger zone cannot freely enter and exit this region. school activities are closed, economic activities are stopped, worship activities are also closed.
why it is important to safe food preparation= stocking food when the danger zone is important. because in the danger zone, people are limited to activities outside the home.
Answer:
B
Keep the temperature at 20°C. Stir the solution
Explanation:
