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Leno4ka [110]
3 years ago
15

Predict the formulas for calcium chloride and potassium phosphate

Chemistry
1 answer:
Sauron [17]3 years ago
8 0

Answer:

CaCl2

And

potasium phosphate is a general name for salt of potassium and phosphate ions . The compounds can exist as

K3PO4 (Tripotassium phosphate)

K2HPO4 (di potassium phosphate)

KH2PO4 (mono potassium phosphate)

Explanation:

Calcium chloride salt is an ionic compound. so it contains both cations and anions. That means it has a positively charged ion and a negatively charged ion. In an ionic compound their is a transfer of electron. The valence electron or the charge ion present in an atom can be use to predict the chemical formula of this compound . Base on the compound the positive end is calcium while the negative end is chlorine .

Ca2+  and Cl-

cross multiply the charges

CaCl2

The charge of phosphate ions are (PO4)3−, (HPO4)2− and (H2PO4)−. And base on the valence electron potassium has a stable charge of +1 (K+). The phosphate ion produces the negative charge when it reacts with potassium.

If potassium goes into reaction with any of the phosphate ion it will be as follows.

K+  and  (PO4)3−

cross multiply the charge as usual

K3PO4(tripotassium phosphate)

K+ and (HPO4)2−

cross multiply the charge as usual

K2HPO4(di potassium phosphate)

K+ and (H2PO4)−

cross multiply the charge as usual

KH2PO4 (mono potassium phosphate)

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enyata [817]

Answer:

52.5 g

Explanation:

Density= mass/volume

Rearranging the equation gives us m= d(V)

m= d(V)

m= (10.5 grams/cm^3)(5 cm^3)

m= 52.5 g

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2 years ago
The mole fraction of CO2 in a certain solution with H2O as the solvent is 3.6 × 10−4. What is the approximate molality of CO2 in
nataly862011 [7]

Answer: C) 0.020 m

Explanation:

Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent.

Molality=\frac{n\times 1000}{W_s}

where,

n = moles of solute  

W_s = weight of solvent in g  

Mole fraction of CO_2 is = 3.6\times 10^{-4} i.e.3.6\times 10^{-4}  moles of CO_2 is present in 1 mole of solution.

Moles of solute (CO_2) = 3.6\times 10^{-4}

moles of solvent (water) = 1 - 3.6\times 10^{-4} = 0.99

weight of solvent =moles\times {\text {Molar mass}}=0.99\times 18=17.82g

Molality =\frac{3.6\times 10^{-4}\times 1000}{17.82g}=0.020

Thus  approximate molality of CO_2 in this solution is 0.020 m

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3 years ago
Why does an exothermic reaction need activation energy?
andrey2020 [161]

Answer:

Activation energy is needed so reactants can move together, overcome forces of repulsion, and to begin breaking bonds.

Explanation:

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Cobalt chloride Select one: a. Does not exist as a hydrate b. Forms a single hydrate which may be pink or blue c. Forms differen
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Answer:

c. Forms different hydrates which have different colors

Explanation:

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