Answer:
its b nasa and every other space obsessed place has done all of that
The answer is Na⁺.
Na⁺ is a positive ion of sodium that is due by the loss of one electron.
4He represents four atoms of helium. It is an idel gas, that do not form elementary molecules and exist in atom form.
Ca represent one atom of calcium and Mg one atom of magnesium. They are metals and do not form elementary molecules.
Answer: 5.26 moles
Explanation:
Given that:
Volume of hydrogen gas V = 8560mL
(since 1000 mL = 1dm3
8560mL = 8560/1000= 8.56dm3)
Standard temperature T = 25°C
Convert temperature in Celsius to Kelvin
(25°C + 273 = 298K)
Pressure P = 1.5atm
Number of moles of hydrogen = ?
Note that Molar gas constant R is a constant with a value of 0.0082 ATM dm3 K-1 mol-1
Then, apply ideal gas equation
pV = nRT
1.5 atm x 8.56dm3 = n x (0.0082 atm dm3 K-1 mol-1 x 298K)
12.84atm dm3 = n x 2.44atm dm3 mol-1
n = (12.84atm dm3 / 2.44atm dm3 mol-1)
n = 5.26 moles
Thus, there are 5.26 moles of Hydrogen, H present in this gas sample.
Exothermic is when energy is released
endothermic is when its being absorbed<span />
Answer:
The trachea, commonly known as the windpipe, is a tube about 4 inches long and less than an inch in diameter in most people. The trachea begins just under the larynx (voice box) and runs down behind the breastbone (sternum).
Explanation:
