Write the definition of a compound.

Chemistry

1 answer:

dybincka [34]4 years ago

6 0

A thing that is composed of tow or more seperate elements

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If a sample of 0.150 g of kcn is treated with an excess of hcl, calculate the amount of hcn formed in grams.

blondinia [14]

<h2> The amount of Hcn formed in grams is = 0.06223 grams</h2><h3> calculation</h3>

write the equation for reaction

that is; KCn + HCl → KCl + HCn

step 1:find the moles of KCn reacted

moles of KCn = mass of KCn/molar mass of KCn( 65.12 g/mol)

= 0.150 g/ 65.12 g/mol =2.303 x10^-3 moles

step 2: use the mole ratio between KCn :HCn which is 1:1 to determine the moles of HCn which is also 2.303 x 10^-3 moles

step 3: find the mass of HCn =moles of HCn x molar mass of HCn

= 2.303 x10^-3 x 27. 02 =0.06223 grams

3 0

4 years ago

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Over [174]

The first answer; Nickel has an atomic number of 28 (28 protons). and cobalt has an atomic number of 27 (27 protons).

6 0

3 years ago

The substitution reaction of toluene with Br2 can, in principle, lead to the formation of three isomeric bromotoluene products.

GREYUIT [131]

Answer:

See explanation and image attached

Explanation:

Aromatic hydrocarbons undergo electrophillic substitution. Usually, substituted benzene is more or less reactive to electrophillic substitution compared to unsubstituted benzene.

Substituents on the benzene ring tend to direct the incoming electrophile during electrophillic substititution. The presence of the -CH3 group on toluene directs the incoming Br electrophile to the ortho/para position.

Where the incoming electrphile E is Bromine, we can see that in the ortho/ para product, the electron pushing -CH3 stabilizes the resonance structure formed and increases electron density at the ortho/para position via resonance compared to the meta product as we can see from the image attached. Hence, the ortho and para products predominate over meta products.

Image credit: Chemistry steps