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raketka [301]
3 years ago
9

An atom of element X has an atomic mass of about 40; after reacting with a second atom of X, a different element (called Y) with

an atomic mass of 80 is produced. What type of reaction is this?
a. fusion
b. fission
c. combustion
d. synthesis
Chemistry
1 answer:
mario62 [17]3 years ago
8 0
The answer is a. fusion. The reaction formed a different element, so this is not a chemical reaction. Then c and d are not correct. Two atoms form one atom, so it is fusion.
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A student puts 0.020 mol of methyl methanoate into an empty and rigid 1.0 L vessel at 450 K. The pressure is measured to be 0.74
stellarik [79]

Explanation:

Starting moles of ethanol acid = 0.020 mol

At the equilibrium 50 % of the ethanol acid molecules reacted

∴ Moles of ethanol acid reacted = 0.020 mol * 50 %/100 %

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Moles of ethanol acid remain = 0.020 mol + 0.010 mol = 0.010 mol

Moles of the product (CH3COOH)^{2} gas formed are calculated as

0.010 mol CH3COOH * 1 mol (CH3COOH)^{2} / 2 mol CH3COOH

= 0.005 mol (CH3COOH)^{2}

Therefore at the equilibrium total moles of gas present in the vessel are 0.010 mol CH3COOH and 0.005 mol (CH3COOH)^{2}

That is total gas moles at equilibrium = 0.010 mol + 0.005 mol = 0.015 mol

Now Calculate the pressure  :

0.020 mol gas has pressure of 0.74 atm therefore at the same condition what will be the pressure exerted by 0.015 mol gas

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3 years ago
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