Which of the following equations best represents the meaning of the law of conservation of mass? mass of reactants ≥ mass of products mass of products ≤ mass of reactants mass of reactants ≠ mass of products mass of products = mass of reactants

mass of reactants = mass of products

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

mass of hydrogen= 4 g

Mass of oxygen = 32 g

mass of water =

Thus mass or reactants =

Mass of hydrogen + mass of oxygen= 4+32= 36 g

Mass of product = mass of water = 36 g

Thus the total mass of reactants is equal to the total mass of products.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.