Answer:
Oxygen has a molar mass of 16.0 g mol−1 , so 1 mole of oxygen atoms has a mass of 16.0 g . Therefore, carbon dioxide has a percent composition of 72.7% oxygen, i.e. for every 100 g of carbon dioxide you get 72.7 g of oxygen
Explanation:
Answer:
B.
Explanation:
Tidal energy is the form of hydropower that converts the energy obtained from tides into useful forms of power.
Answer:
Al
Explanation:
Protons = mass number - neutrons 56-30 =26 closest is Al 27
Also in group 13 which loses 3 electrons to be +3
Answer:
0.65atm or 65.3kPa
Explanation:
Given parameters:
Initial volume of He = 500mL
Initial pressure = 98kPa, this gives 0.967atm
Final volume = 750mL
Unknown:
Final pressure = ?
Solution:
A good grasp of Boyle's law should suffice here. The law states that:
"the volume of a fixed mass of gas varies inversely as the pressure changes if the temperature is constant".
Mathematically;
P₁ V₁ = P₂ V₂
where P and V are pressure and volume
1 and 2 are the initial and final states;
Now, solve for the unknown P₂;
0.967 x 500 = P₂ x 750
P₂ = 0.65atm or 65.3kPa