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3 years ago

The process of _______ begins in the mouth, where for is ground into small pieces.

Chemistry

2 answers:

krek1111 [17]3 years ago

5 0

Umm... excretion sorry not sure about that one. Hope this helsp

ziro4ka [17]3 years ago

4 0

B) saliva.

excretion is waste in liquid form as in pee which does not begin in the mouth so it's wrong.
waste obviously does not begin in the mouth.
digestion begins in your stomach, not your mouth.
saliva starts in the mouth and then processes on. So saliva is correct

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Read 2 more answers

A calorimeter contains 22.0 mL of water at 14.0 ∘C . When 2.50 g of X (a substance with a molar mass of 82.0 g/mol ) is added, i

Alik [6]

Answer:

The enthalpy change in the the reaction is -47.014 kJ/mol.

Explanation:

$X(s)+H_2O(l)\rightarrow X(aq)$

Volume of water in calorimeter = 22.0 mL

Density of water = 1.00 g/mL

Mass of the water in calorimeter = m

$m=1.00 g/mL\times 22.0 mL=22 g$

Mass of substance X = 2.50 g

Mass of the solution = M = 2.50 g + 22 g = 24.50 g

Heat released during the reaction be Q

Change in temperature =ΔT = 28.0°C - 14.0°C = 14.0°C

Specific heat of the solution is equal to that of water :

c = 4.18J/(g°C)

$Q=Mc\times \Delta T$

$Q=24.50 g\times 4.18 J/g ^oC\times 14.0^oC=1,433.74 J=1.433 kJ$

Heat released during the reaction is equal to the heat absorbed by the water or solution.

Heat released during the reaction =-1.433 kJ

Moles of substance X= $\frac{2.50 g}{82.0 g/mol}=0.03048 mol$

The enthalpy change, ΔH, for this reaction per mole of X:

$\Delta H=\frac{-1.433 kJ}{0.03048 mol}=-47.014 kJ/mol$

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2 years ago

The molecular mass of sodium oxide (Na2O) is

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