Consider a hypothetical reaction in which a and b are reactants and c and d are products. if 25 grams of a completely reacts with 26 grams of b to produce 14 grams of c, how many grams of d will be produced?

According to law of conservation of mass, the mass can neither be destroyed nor created in a chemical reaction.  The mass of reactants and mass of products are equal in a chemical reaction.

The reaction between A and B (reactants) to form C and D (products) is given as:

The mass of A = (given)

The mass of B = (given)

The mass of reactant = mass of A + mass of B

Substituting the values:

The mass of reactant =

The mass of C =

Let the mass of D =

So, the mass of product = mass of C  + mass of D

Substituting the values:

the mass of product =

According to law of conservation of mass:

the mass of reactant = the mass of product

Substituting the values,

Hence, the amount of D produced in the reaction is .

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

the answer is d. 74.02