How does the law of conservation of mass apply to this reaction:
c2h4 + 3o2 → 2h2o + 2co2 ?
the equation needs to be balanced.
there are fewer oxygen atoms in the equation than hydrogen or carbon. only
the oxygen needs to be balanced.
there are equal numbers of hydrogen and carbon. each element needs to be
balanced.
the law of conservation of mass has already been applied. there is an equal
number of each element on both sides of the equation.

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step-by-step explanation:

d = distance between moon and sun, which in this problem is the hypotenuse of a right triangle.  

the distance y is the side opposite to angle x in the right triangle.   use the definition of the sine function from basic trigonometry.

sin(x) = y/d ⇒

d = y/sin(x)

example 2 – simplify: step 1: completely factor both the numerators and denominators of all fractions. step 2: change the division sign to a multiplication sign and flip (or reciprocate) the fraction after the division sign; essential you need to multiply by the reciprocal. step 3 : cancel or reduce the fractions.

it is true

step-by-step explanation:

all the combinations add up i used   calculator