If 7.50g of CuNO3 is dissolved in water to make a 0.420M solutions what is the volume of the solution in milliliters

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if you mean hydrogen and oxygen then water is the product

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.