1) How many molecules of ethane (C6H6) are present in 0.592g of C2H6? (scientifi

Question

1) How many molecules of ethane (C6H6) are present in 0.592g of C2H6? (scientific notation).

2) How many atoms are in 15.49g of copper (Cu)? (scientific notation)

3) Write an unbalnced equation to represent each of the following reactions. Do not include phase abbreviations.

(a) Potassium hydroxide and phosphate and water

(b) Zinc and silver chloride react to form zinc chloride and silver

(c) Sodium hydrogen carbonate reacts to form sodium carbonate, water, and carbon.

(d) Ammonium nitrite reacts to form nitrogen and water.

(e) Carbon dioxide and potassium hydroxide react to form potassium carbonate and water.

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Explanation / Answer

a)molar mass=24+6=30

so number of molecules=6.023*10^23*0.592/30

=1.19*10^22 molecules

b)molar mass=63.5

so number of moles=15.49/63.5

so number of atoms=6.023*10*15.49/63.5

=1.47*10^23 atoms

3) KOH + PO4 3- +H2O---?> H2O + K3PO4

b)Zn + 2AgCl---> ZnCl2 + 2Ag

c)NaHCO3 --->. Na2CO3 + H2O + C

d) NH4NO2 --->. NH3 + H2O

e)CO2 +KOH---> KCO3 +H2O

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