If 20 grams of calcium combines completely with 16 grams of sulfur to form a compound, what

is the percent composition of calcium in the compound?

55.56% of Ca

Explanation:

Percent composition is a therm in chemistry defined as the ratio by mass between an element and the compound formed from this element.

In the problem, 20g of Ca are combined with 16g of S to form a compound. The mass of the compound is:

20g + 16g = 36g

Thus, percent composition of calcium is:

20g Ca / 36g × 100 = 55.56% of Ca

the answer to your question is c.

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the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.