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Lapatulllka [165]
2 years ago
9

A truckload of apples weighs 2550 lbs. If 5 (exact) apples weigh 1250 g, how many apples are in the truck?

Chemistry
1 answer:
egoroff_w [7]2 years ago
3 0

Answer:

There are 4,626 apples in the truck.

Explanation:

Mass of  5 apples = 1250

Mass of an apple = \frac{1250 g}{5}=250 g

Mass of apples in the truck = 2550 lbs

1 lbs = 453.592 g

2550 lbs=2550\times 453.592 g

Let the number of apples with mass of 2550 lbs be a.

a\times 250 g=2550\times 453.592 g

a=\frac{2550\times 453.592 g}{250 g}=4,626.63

4,626.63 ≈ 4,626

So, there are 4,626 apples in the truck.

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Carbon-14 is best used to find the age of:
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anciet fossils

Explanation:

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3 years ago
The complete combustion of copper(I) sulphide is according to the following equation:
MaRussiya [10]

Answer:

a) 7.94 x 10²³ molecules, b) 5.62 g SO2, c) 1.97 L

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b) Since the molar ratios of Cu2S to SO2 is 1:1, 0.0880 mol of Cu2S produces 0.0880 mol SO2. To convert mol to grams, we use the molar mass of SO2 (64.06 g/mol) to figure out that 0.0880 mol SO2 = 5.63 g SO2.

c) At STP, 1 mol occupies 22.4 liters. 0.0880 mol SO2 x 22.4 L/1 mol = 1.97 L

If you would like more tutoring in chemistry or other subjects for FREE, check out growthinyouth.org.

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3 years ago
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3 0
2 years ago
What is the standard cell notation for a galvanic cell made with silver and nickel?
MA_775_DIABLO [31]
Answer:

<span>Ni<span>(s)</span><span><span>∣∣</span>N<span>i<span>2+</span></span><span>(aq)</span> <span>∣∣</span></span><span><span>∣∣</span> A<span><span>g+</span><span>(aq)</span></span><span>∣∣</span></span>A<span>g<span>(s)</span></span></span>

Explanation:

Start by finding the standard reduction potential for the <span>A<span>g+</span></span> and <span>N<span>i<span>2+</span></span></span> ion. Normally, the values are listed at the back of most chemistry textbooks.

<span>A<span><span>g+</span><span>(aq)</span></span>+1<span>e−</span>→A<span>g<span>(s)</span></span> <span>Eo</span>=0.80 V</span>
<span>N<span>i<span>2+</span></span><span>(aq)</span>+2<span>e−</span>→Ni<span>(s)</span> <span>Eo</span>=−0.23 V</span>

In the galvanic cell, the reaction is spontaneous and for a spontaneous reaction <span>E<span>o<span>cell</span></span></span>must be a positive quantity.

<span><span>E<span>o<span>cell</span></span></span>=<span>E<span>o<span>Anode</span></span></span>+<span>E<span>o<span>cathode</span></span></span></span>

Manipulate the two equations so that <span>E<span>o<span>cell</span></span></span> is positive. Note that the anode is the site of oxidation (where electrons are lost) and the cathode (where electron are gained) is the site for reduction.

<span>A<span><span>g+</span><span>(aq)</span></span>+<span>1<span>e−</span></span>→A<span>g<span>(s)</span></span> <span>Eo</span>=0.80 V</span>
<span>Ni<span>(s)</span>→N<span>i<span>2+</span></span><span>(aq)</span>+<span>2<span>e−</span></span> <span>Eo</span>=0.23 V</span>

<span>2×<span>{A<span><span>g+</span><span>(aq)</span></span>+1<span>e−</span>→A<span>g<span>(s)</span></span>}</span> <span>Eo</span>=0.80 V <span>(Cathode)</span></span>
<span>Ni<span>(s)</span>→N<span>i<span>2+</span></span><span>(aq)</span>+2<span>e−</span> <span>Eo</span>=0.23 V <span>(Anode)</span></span>
<span> <span>−−−</span></span>
<span>2A<span><span>g+</span><span>(aq)</span></span>+Ni<span>(s)</span>→N<span>i<span>2+</span></span><span>(aq)</span>+2A<span>g<span>(s)</span></span> <span>E<span>o<span>cell</span></span></span>=1.03 V</span>

Start with the anode components (site of oxidation) - the cathode components are listed to the right.

<span>Ni<span>(s)</span><span><span>∣∣</span>N<span>i<span>2+</span></span><span>(aq)</span> <span>∣∣</span></span><span><span>∣∣</span> A<span><span>g+</span><span>(aq)</span></span><span>∣∣</span></span>A<span>g<span>(s)</span></span></span>

The single vertical lines indicate the boundary (phase difference) between solid <span>Ni</span>and <span>N<span>i<span>2+</span></span></span> ions in the aqueous solution of the first compartment and between solid <span>Ag</span> and <span>A<span>g+</span></span> ions present in the aqueous solution of the second compartments.

The double vertical lines refer to the salt bridge - note that the salt bridge must be an inert salt to both ions present in both compartments of the galvanic cell ...

5 0
3 years ago
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