What number would you write before water in the formula for calcium carbonate hexahydrate? 4 5 6 7

1 answer:

7 0

Calcium Carbonate Hexahydrate
(Ca C O3 6H20)

The number you would write before water in the formula for calcium carbonate hexahydrate would be 6.

Facts about Calcium Carbonate Hexahydrate:
<span>This compound often crystallises when Essex river waters are softened by the lime/soda process. Formation of the hydrated salt is favoured by low water temperatures and by high orthophosphate levels. Calcium carbonate hexahydrate forms pure well-defined crystals which are considerably more soluble in water than calcite, the usual product of lime/soda softening. </span>

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How many hydrogen atoms are in 7.80 mol of ammonium sulfide?

Alexus [3.1K]

The number of hydrogen atoms that are in 7.80 moles of ammonium sulfide are 3.756 x 10^25 atoms

<u>calculation</u>

Step 1: calculate the moles of H in (NH4)2S

since there are 8 atoms of H in (NH4)2S the moles of

H = 8 x7.80 = 62.4 mole

Step 2: use of Avogadro's law constant to determine the number of H atom

that is 1 mole = 6.02 x10^23 atoms

62.4 moles=? atoms

cross multiplication

= [ 62.4 x 6.02 x10^23]/ 1 mole= 3.756 x10^25 atoms

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4 years ago

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How do you know the correct number of significant figures to include in an answer?

bogdanovich [222]

Answer:

Explanation:

1 Non-zero digits are always significant.

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A site in Pennsylvania receives a total annual deposition of 2.688 g/mof sulfate from fertilizer and acid rain. The ratio by mas

sertanlavr [38]

According to the statement

2.12 x 10^4 lbs pounds of CaCO₃ are needed to neutralize this acid

<h3>What is neutralization?</h3>

A chemical reaction in which an acid and a base react quantitatively with each other is known as neutralization or neutralization. In a water reaction, neutralization ensures that there is no excess of hydrogen or hydroxide ions in the solution.

<h3>According to the given information:</h3>

The equation of the neutralization reaction between H2SO4 and CaCO3.

CaCO3 + H2SO4 → CaSO4 + H2CO3

H2CO3 dissociate to water and carbon dioxide.

CaCO3 + H2SO4 → CaSO4 + H2O + CO2

Now solving for the mass of CaCO3 needed to neutralize the acid.

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