The density of a substance is 1.63 grams per mililiter what is the mass of 0.25 liters of the substance in grams?

The answer to this question is 407.5 g

We know that

So, 0.25 L will be equal to 250 ml. ( Unit must be same)

Formula

Se, mass of the substance is 407.5 g

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west