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artcher [175]
4 years ago
6

An element's atomic number is 29. How many protons would an atom of this element have?

Chemistry
2 answers:
LenKa [72]4 years ago
8 0
It would have 29 I think
lesantik [10]4 years ago
5 0

This one is a hard one. The answer is 29 :P

P.S - the atomic number 29 is Copper.

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How many moles of CO are there in 1.40 x 10^24 molecules.
viva [34]

Answer:

Explanation:

Mole = no. Molecules/6.02×10^23

Mole = (1.40×10^24)/(6.02×10^23)

Mole = 2.33mole

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The density of a material is a/an
sukhopar [10]

Answer:

thanks! it's C) Intensive property

Explanation:

thank you for support and love this one!

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3 years ago
Each of the following models represents particles present before and after a
lana [24]

Answer:

D

Explanation:

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3 years ago
Ethanol (c2h5oh) melts at -114c and boils at 78 c the enthalpy of fusion of ethanol is 5.02 kj/mol, and its enthalpy of vaporiza
vovikov84 [41]
<span>100 kilo joules There are several phases that this problem undergoes and the final answer is the sum of all the energy used for each phase. Phase 1. Heating of solid ethanol until its melting point. Phase 2. Melting of the ethanol until it's completely liquid. Phase 3. Heating of the liquid ethanol until it reaches its boiling point. Phase 4. Boiling the ethanol until it's completely vapor. To make things more interesting, some of our constant are per gram and some others are per mole. So let's calculate how many moles of ethanol we have. Atomic weight carbon = 12.0107 Atomic weight hydrogen = 1.00794 Atomic weight oxygen = 15.999 Molar mass ethanol = 2*12.0107 + 6*1.00794 + 15.999 = 46.06804 g/mol Moles ethanol = 75g / 46.06804 g/mol = 1.628026719 mol Phase 1. Use the specific heat of solid ethanol and multiply by the number of degrees we need to change by the mass we have. So 0.97 J/g*K * 75 g * (-114c - -120c) = 0.97 J/g*K * 75 g * 6K = 436.5 J Phase 2: Time to melt. Just need the moles and the enthalpy of fusion. So: 1.628026719 mol * 5.02 kJ/mol = 8.172694128 kJ Phase 3: Heat to boiling. Just like heating to melting, just a different specific heat and temperature 2.3J/g*K * 75g * (78c - -114c) = 2.3J/g*K * 75g * 192 K = 33120 J Phase 4: Boil it to vapor. Need moles and enthalpy of vaporization. So 1.628026719 mol * 38.56 kJ/mol = 62.77671027 kJ Now let's add them together: 436.5 J + 8.172694128 kJ + 33120 J + 62.77671027 kJ = 0.4365 kJ + 8.172694128 kJ + 33.120 kJ + 62.77671027 kJ =104.5059044 kJ Since the least precise datum we have is 2 significant figures, round the result to 2 significant figures, giving 100 kilo joules.</span>
3 0
4 years ago
Three ways how travelers should be considerate towards other travelers when using public transport​
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