Chemistry, 30.08.2019 18:40 ash062701

2. how many grams of water can be heated from 20.0 oc to 75oc using 12500.0 joules?

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Specific heat capacity is the amount of energy that required to increase the temperature 1kg of substance by $\bold{1^oC}$ . The 54.1 g of water can be heated from $\bold{20^oC}$ to $\bold{ 75^oC}$ using 12500 J.

Specific Heat Capacity:

It is the amount of energy that required to increase the temperature 1kg of substance by $\bold{1^oC}$ .

The specific heat formula,

$\bold{ Q = mc \Delta T}$

Where,

Q - Energy absorbed = 12500 J

m - mass(grams) = ?

c - specific heat = 4,200 J/ kg/ $\bold { ^oc}$

$\bold{ \Delta T}$ - change in temperature in kelvin = 75 -20 = $\bold{55^oC}$

Put the values is the formula,

$\bold{12500J = m\times 4200J/kg /^oC \times 55^oC}$

Solve the equation for m

m = 0.0541 kg = 54.1 g

Hence, we can conclude that the 54.1 g of water can be heated from $\bold{20^oC}$ to $\bold{ 75^oC}$ using 12500 J.

To know more about Specific Heat, refer to the link:

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Answer from: genyjoannerubiera

The mass of the water that can be heated from 20 °C to 75 °C using 12500.0 J is 54.32 g

We'll begin by calculating the change in the temperature of the water. This can be obtained as follow:

Initial temperature (T₁) = 20 °C

Final temperature (T₂) = 75 °C

Change in temperature (ΔT) =?

ΔT = T₂ – T₁

ΔT = 75 – 20

ΔT = 55 °C Finally, we shall determine the mass of the water. This can be obtained as follow:

Change in temperature (ΔT) = 55 °C

Heat (Q) = 12500.0 J

Specific heat capacity of water (C) = 4.184 J/gºC

Mass of water (M) =? Q = MCΔT

12500 = M × 4.184 × 55

12500 = M × 230.12

Divide both side by 230.12

M = 12500 / 230.12

M = 54.32 g

Thus, the mass of the water is 54.32 g

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Answer from: Quest

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

Answer from: Quest

Change in speed or direction : )

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