Answer:
An ecliptic is the trajectory drawn by the race of the Sun on the celestial vault. This is the geocentric point of view, seen from the Earth.
An eclipse occurs when the Moon passes through this plane (in two points, called nodes), precisely at the time of the New Moon or Full Moon. The Sun, the Earth and our satellite are then aligned. In the first case, it will be a solar eclipse (the Moon is between the Earth and the Sun). In the second, it will be a lunar eclipse
51.3 gram of water should form if 32.5 g of NH₃ react with enough oxygen.
<h3>How to find the Number of moles ?</h3>
To calculate the number of moles use the formula
Number of moles = 
= 
= 1.9 mol
4NH₃ + 5O₂ → 4NO + 6H₂O
4 mol of NH₃ react with oxygen to given 6 mole of water.
So 1.9 mol of NH₃ produces = 
= 2.85 mol of water
Mass of water = Molar Mass of water × Number of moles of water
= 18 × 2.85
= 51.3 gram
Thus from the above conclusion we can say that 51.3 gram of water should form if 32.5 g of NH₃ react with enough oxygen.
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Velocity = 15 m/s
90/2 = 45 m
45/3 (seconds to reach) = 15 m
Im not sure what the answer is unless you put the options up for the multiple choice