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Svetach [21]
4 years ago
10

An unknown substance is made only of identical atoms that cannot be broken down. this substance is a ________.mixtureelementcomp

ound
Chemistry
1 answer:
Ira Lisetskai [31]4 years ago
6 0
The substance is a element.
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What is normal body temperature in degrees celsius? express your answer numerically in degrees celsius?
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3 years ago
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If the volume occupied by the gas molecules shown below were doubled, what would happen to the pressure they exert? (Assume cons
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there's no picture here but I guess the answer would be:

considering the constant temperature, if you double the volume, the pressure would be halved.

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3 0
4 years ago
How many moles of water are produced if 5.43 mol PbO2 are consumed
Mariana [72]
It has to be understood that 2 moles of oxygen are there in each mole of PbO2. Then it has to be calculated for 2 moles of oxygen.

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5 0
3 years ago
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What is the mass of 22.4 L of H2O at STP?
Andrew [12]
Answer is: <span>A. 18.02 g/mol.

At standard temperature and pressure 1 mol of gas occupied 22.4 liters:
V(H</span>₂O) = 22.4 L; volume of water.
Vm = 22.4 L/mol; molar volume at STP.
n(H₂O) = V ÷ Vm.
n(H₂O) = 22.4 L ÷ 22.4 L/mol.
n(H₂O) = 1 mol; amount of substance (water).
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M(H₂O) = 18.02 g/mol; molar mass of water.
3 0
3 years ago
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