Aplant food is to be made from three chemicals. the combined amounts of the first two chemicals must be 60% of the resulting mix. the second and third chemicals must be in the ratio of 4 to 3 by weight. how much of each chemical is needed to make 850 kg of the plant food?

a = 57 kg

b = 453 kg

c = 340 kg

Explanation:

Let's call the amount of each chemical a, b and c. We can write the statements in a symbolic way.

The combined amounts of the first two chemicals must be 60% of the resulting mix.

a + b = 0.6 × 850 kg

a + b = 510 kg [1]

The second and third chemicals must be in the ratio of 4 to 3 by weight.

[2]

The total amount is 850 kg.

a + b + c = 850 kg [3]

From [3], we have,

a + b + c = 850 kg

a + b = 850 kg - c [4]

Now, we can equal [1] and [4].

510 kg = 850 kg - c

c = 340 kg

If we replace this value in [2]:

From [3]:

a + b + c = 850 kg

a = 850 kg - b - c

a = 850 kg - 453 kg - 340 kg = 57 kg

c. 75.7

i think that is the right

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.