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stepan [7]
2 years ago
7

Rank the following elements by electron affinity, from most positive to most negative EA value.

Chemistry
1 answer:
LenKa [72]2 years ago
3 0

Answer:

Explanation:

Bromine >Tellurium > Phosphorus > Helium > Sodium

Electron affinity of Bromine , Tellurium , Phosphorus are positive , of helium is zero and of sodium is negative .

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Which chemical change ? A.boiling B.freezing C.burning D.melting
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How many moles are present when there are 1.00.1026 molecules of water?
liraira [26]

Answer: 1.00×10^26=1000×10^23

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Explanation:

3 0
3 years ago
The reaction nacl(s) → nacl(aq) is performed in a coffee cup calorimeter, using 100 ml of h2o(l) and 5.00g of nacl. if the tempe
MrRissso [65]

Since the density of water is 1 g /mL, hence there is 100 g of H2O. So total mass is:

m = 100 g + 5 g = 105 g

 

=> The heat of reaction can be calculated using the formula:

δhrxn = m C ΔT

where m is mass, C is heap capacity and ΔT is change in temperature = negative since there is a decrease

 

δhrxn = 105 g * 4.18 J/g°C * (-2.30°C)

δhrxn = -1,009.47 J

 

=> However this is still in units of J, so calculate the number of moles of NaCl.

 

moles NaCl = 5 g / (58.44 g / mol)

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=> So the heat of reaction per mole is:

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5 0
3 years ago
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