The answer is A-Gravity. Why? This is because B and C are examples of chemical weathering and not mechanical. Although choice D may seem viable lava intrusion is not a direct cause of mechanical weathering although lava pushing upward may help in aiding mechanical weathering it would not be considered a big enough cause, thus gravity is the correct answer.
Answer:1 mol of Mg(NO3)2 contains 6.022*10^23 molecules
3 mol Mg(NO3)2 contains 3*6.022*10^23 = 1.81*10^24 molecules
Each Mg(NO3)2 molecule contains 2 N atoms
Number of N atoms = 2*1.81*10^24 = 3.62*10^24 N atoms.
The answer is: [D]: a reactant.
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The formula for force is F=ma. Because weight is a measure of force, then we can substitute the weight of the meteor, 3204 N, for F in the the equation for force. We also know that the acceleration of gravity on Earth is 9.8 m/s^2. To find the mass, simply divide both sides of the equation by the value of acceleration to get
![m = \frac{f}{a} = \frac{3204}{9.8} = 326.9](https://tex.z-dn.net/?f=m%20%3D%20%20%20%5Cfrac%7Bf%7D%7Ba%7D%20%20%3D%20%20%5Cfrac%7B3204%7D%7B9.8%7D%20%20%3D%20326.9)
Therefore, the value of the mass of the meteor is 326.9 kg.