Answer:
169
Explanation:
protons+neutrons=atomic mass
70+99=169
Answer: 127 m
Explanation:
4500 mg/L . 35.5 g/mol = 127 m
of oxygen at STP would be required to react completely with 38.8g of propane.
<u>Given that :</u>
molar mass of propane = 44 g/mol
mass of propane = 38.8 g
∴ Moles present in 38.8 g of propane =
= 0.88 mole
<u>applying rule of balanced equations </u>
1 mole of propane = 5 moles of oxygen
0.88 mole of propane = 5 * 0.88 = 4.4 moles of oxygen
Note : volume of 1 mole of oxygen at STP = 
∴Total volume of oxygen required at STP = 22.4 * 4.4 = 
Hence we can conclude that the volume of oxygen at STP required to react completely 
Learn more : brainly.com/question/16998374
Brass is a homogeneous mixture.
In the liquid state, the copper and zinc formed a solution.
They did not separate from each other when the brass solidified.
Thus, brass is a solid solution.
That’s the SI unit of energy or work