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alexira [117]
3 years ago
11

Notice what happens to the numbers of protons, neutrons, and electrons when you

Chemistry
1 answer:
babymother [125]3 years ago
3 0

Answer:

Only the number of neutrons change.

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Determine the Density of a mass = 2000g and volume = 80ml
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Explanation:

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D = 2000/80 = 25

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Why does 10g Nitrogen gas contain the same number of molecules as 10 g of carbon monoxide​
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What mass of CaSO3 must have been present initially to produce 14.5 L of SO2 gas at a temperature of 12.5°C and a pressure of 1.
german
When the reaction equation is:

CaSO3(s) → CaO(s) + SO2(g)

we can see that the molar ratio between CaSO3 & SO2 is 1:1 so, we need to find first the moles SO2.

to get the moles of SO2 we are going to use the ideal gas equation:

PV = nRT

when P is the pressure =  1.1 atm

and V is the volume = 14.5 L 

n is the moles' number (which we need to calculate)

R ideal gas constant = 0.0821

and T is the temperature in Kelvin = 12.5 + 273 = 285.5 K

so, by substitution:

1.1 * 14.5 L = n * 0.0821 * 285.5

∴ n = 1.1 * 14.5 / (0.0821*285.5)

       = 0.68 moles SO2

∴ moles CaSO3 = 0.68 moles

so we can easily get the mass of CaSO3:

when mass = moles * molar mass

and we know that the molar mass of CaSO3= 40 + 32 + 16 * 3 = 120 g/mol


∴ mass = 0.68 moles* 120 g/mol = 81.6 g
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3 years ago
Type the letter of the correct answer in the blank space. The image shows the combustion of methane. Which equation represents t
Talja [164]

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CH4 + 2O2 → CO2 + 2H2O

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