3 months ago

A change in the state of matter is caused if enough _____ is added to or removed from an object.

1 answer:

4 0

Answer:

The alteration in the state of matter occurs when sufficient thermal energy is either added to or taken away from an object.

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Anarel [2989]

The balanced chemical equation for the neutralization of HCl with $NaHCO_{3}$ is:

$HCl (aq) + NaHCO_{3}(aq)--> NaCl (aq) + H_{2}O(l)+CO_{2} (g)$

Given weight of $NaHCO_{3}$ = 5g

Moles of $NaHCO_{3}$ = $5 g *\frac{1 mol}{84 g} = 0.05952 mol NaHCO_{3}$

Volume of HCl solution = $50 cm^{3} * \frac{1 mL}{1cm^{3}} = 50 mL$

Assuming the density of the solution is 1.0 g/mL

Mass of HCl solution = 50 g

Overall mass of the solution = 50 g + 5 g = 55 g

To find the heat of neutralization, we calculate:

Q = m C ΔT

where m equals the mass of the solution = 55 g

C represents the specific heat capacity of the solution = 4.184 $\frac{J}{g. ^{0}C}$

ΔT signifies the temperature change = 6.8 K = (6.8 - 273) C = -266.2 $^{0}C$

$Q = 55 g * 4.184 \frac{J}{g. K}(6.8K) = 1565 J$

The enthalpy of neutralization per mole of $NaHCO_{3}$

= $\frac{1565J}{0.05952 mol} = 26294 \frac{J}{mol}*\frac{1 kJ}{1000J} =26.294kJ/mol$

3 0

4 months ago

alisha [2963]

<span>13.6
grams of mercury are present in a barometer that holds
per milliliter.
13.6*6.5 = 88.4</span>

3 0

3 months ago

A change in the state of matter is caused if enough _____ is added to or removed from an object.​