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Sedbober [7]
4 years ago
5

Select the correct answer from each drop-down menu.

Chemistry
1 answer:
stealth61 [152]4 years ago
5 0

Answer:

Light energy; chemical

Explanation:

The light energy of the Sun is converted into chemical energy by the plants.

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In the following reaction, 451.4g of lead reacts with excess oxygen forming 356.7g of lead (II) oxide. Calculate the percent yie
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Given the reaction 2Pb(s)+O2(g)= 2PbO(s) and a reactant amount of 451.4 grams, we are asked for the yield of the reaction. The amount of lead present produces 451.4/207.2 *( 2/2) *(223.2) via 100% conversion, 486.26 grams lead (II) oxide. hence the percent yield is 356.7g /<span>486.26 g or equal to 73.35 percent</span>
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4 moles of monoatomic ideal gas is compressed adiabatically causing the temperature to increase from 300 K to 400 K. Calculate t
yawa3891 [41]

Answer:

the work done on the gas is 4,988.7 J.

Explanation:

Given;

number of moles of the monoatomic gas, n = 4 moles

initial temperature of the gas, T₁ = 300 K

final temperature of the gas, T₂ = 400 K

The work done on the gas is calculated as;

W = \Delta U = nC_v(T_2 -T_1)

For monoatomic ideal gas: C_v = \frac{3}{2} R

W = \frac{3}{2} R \times n(T_2-T_1)

Where;

R is ideal gas constant = 8.3145 J/K.mol

W = \frac{3}{2} R \times n(T_2-T_1) \\\\W = \frac{3}{2} (8.3145) \times 4(400-300) \\\\W =  \frac{3}{2} (8.3145) \times 4(100)\\\\W = 4,988.7 \ J

Therefore, the work done on the gas is 4,988.7 J.

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Which metalloid has the weakest shielding effect?
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