3 years ago

How many atoms are in 4Ca3(PO4)2

Chemistry

1 answer:

Allisa [31]3 years ago

4 0

Answer:

I personally don't know how to do this but this is what I was told the answer is

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I think Geothermal but I’m not 100% sure

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How much heat is absorbed/released when 20.00 g of NH3(g) reacts in the presence of excess O2 (g) to produce NO (g) and H2O (l)

FrozenT [24]

Answer:

a. 342.9 kJ of heat are absorbed.

Explanation:

Calculation of the moles of $NH_3$ as:-

Mass = 20.00 g

Molar mass of $NH_3$ = 17.031 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{20.00\ g}{17.031\ g/mol}$

$Moles= 1.1743\ mol$

Given that:- $\Delta H=+1168\ kJ$

It means that 1 mole of $NH_3$ undergoes reaction and absorbs 1168\ kJ of heat

So,

1168 mole of $NH_3$ undergoes reaction and absorbs $1168\times 1168\ kJ$ of heat

<u>Amount of heat absorbed = + 342.9 KJ</u>

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3 years ago

classify the following compounds as ionic (metal + nonmetal) , covalent (nonmetal + nonmetal) or both (compound containing a pol

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3. covalent

4. both

Explanation:

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Cooling the concentrated ammonia and hydrochloric acid before carrying out the experiment increased the time taken for the white

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