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slega [8]
3 years ago
11

The world produces about 3.9 billion tons of food every year. Of that amount, approximately 2.6 billion tons is consumed each ye

ar. The rest is wasted. What percentage of food is wasted every year? Choose the closest answer.
a.30%
b.33.33%
c.60%
d.66.66%
Chemistry
2 answers:
pentagon [3]3 years ago
6 0
B. Without a doubt,
(3.9-2.6)÷3.9
=33.3333...
≈33.33%
nika2105 [10]3 years ago
4 0

B.  33.33%                                                                                                                                                  hope this helps


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Answer:

The concentration of the solution will be much lower than 6M

Explanation:

To prepare a solution of a solid, the appropriate mass is taken and accurately weighed in a weighing balance and then made up to mark with distilled water.

From

n= CV

n = number of moles m/M( m= mass of solid, M= molar mass of compound)

C= concentration of substance

V= volume of solution

m=120g

M= 40gmol-1

V=500ml

120/40= C×500/1000

C= 120/40× 1000/500

C=6M

This solution will not be exactly 6M if the student follows the procedure outlined in the question. The actual concentration will be much less than 6M.

This is because, solutions are prepared in a standard volumetric flask. Using a 1000ml beaker, the student must have added more water than the required 500ml thereby making the actual concentration of the solution less than the expected 6M.

7 0
3 years ago
the heat of fusion of acetone is 5.7 kJ/mol. Calculate to two significant figures the entropy change when 6.3 mol of acetone mel
shtirl [24]

<u>Answer:</u> The entropy change of the process is 2.0\times 10^2J/K

<u>Explanation:</u>

To calculate the entropy change for different phase at same temperature, we use the equation:

\Delta S=n\times \frac{\Delta H_{f}}{T}

where,  

\Delta S = Entropy change

n = moles of acetone = 6.3 moles

\Delta H_{f} = enthalpy of fusion = 5.7 kJ/mol = 5700 J/mol    (Conversion factor:  1 kJ = 1000 J)

T = temperature of the system = -94.7^oC=[273-94.7]=178.3K

Putting values in above equation, we get:

\Delta S=\frac{6.3mol\times 5700J/mol}{178.3K}\\\\\Delta S=201.4J/K=2.0\times 10^2J/K

Hence, the entropy change of the process is 2.0\times 10^2J/K

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3 years ago
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5 0
2 years ago
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A 20 ml sample of .875 m hcl solution was diluted t o150 ml. calculate the molarity of the resulting solution
Veronika [31]
0.11666667 because M1V1=M2V2
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How are protons and neutrons different from and similar to each other?
eimsori [14]

Answer: similar: Protons and neutrons have approximately the same mass, about 1.67 × 10-24 grams. Different:Protons are a type of subatomic particle with a positive charge. And  Neutrons are a type of subatomic particle with no charge (they're neutral).

Explanation:

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