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Mariana [72]
3 years ago
5

how many calories are absorbed by a pot of water with a mass of 500 g in order to raise the temperature from 20 c to 30 c

Chemistry
1 answer:
mihalych1998 [28]3 years ago
3 0
Answer:
             Q  =  5 kCal

Solution:

The equation used for this problem is as follow,

                                                  Q  =  m Cp ΔT

Where;
            Q  =  Heat  =  ?

            m  =  mass  =  500 g

            Cp  =  Specific Heat Capacity  =  4.18 J.g⁻¹.°C⁻¹

            ΔT  =  Change in Temperature  =  30 °C - 20 °C  =  10 °C

Putting values in eq. 1,

                             Q  =  500 g × 4.18 J.g⁻¹.°C⁻¹ ×  10 °C

                             Q  =  20900 J

                             Q  =  4.99 kCal ≈ 5 kCal
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Answer:

(a) Yes, he should be worried. The Fatal accident rate (FAR) is too high according to standars of the industry. This chemical plant has a FAR of 167, where in average chemical plants the FAR is about 4.

(b) FAR=167 and Death poer person per year = 0.0033 deaths/year.

(c) The expected number of fatalities on a average chemical plant are one in 12500 years.

Explanation:

Asumming 50 weeks of work, with 40 hours/week, we have 2000 work hours a year.

In 300 years we have 600,000 hours.

With these estimations, we have (1/600,000)=1.67*10^(-6) deaths/hour.

If we have 2000 work hours a year, it is expected 0.0033 deaths/year.

1.67*10^{-6} \frac{deaths}{hour}*2000 \frac{hours}{year}=0.0033 deaths/year

The Fatal accident rate (FAR) can be expressed as the expected number of fatalities in 100 millions hours (10^(8) hours).

In these case we have calculated 1.67*10^(-6) deaths/hour, so we can estimate FAR as:

FAR=1.67*10^{-6} \frac{deaths}{hour}*10^{8}  hours=1.67*10^{2} =167

A FAR of 167 is very high compared to the typical chemical plants (FAR=4), so the worker has reasons to be worried.

If we assume FAR=4, as in an average chemical plant, we expect

4\frac{deaths}{10^{8} hour} *2000\frac{hours}{year}=8*10^{-5} \frac{deaths}{year}

This is equivalent to say

\frac{1}{8*10^{-5} } \frac{years}{death}=1.25*10^{4} \frac{years}{death} =12500 \, \frac{years}{death}

The expected number of fatalities on a average chemical plant are one in 12500 years.

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Answer:

Kinetic energy is an energy that can be applied to another object, often considered the energy of motion.

Explanation:

Metals are generally good conductors of heat.

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What reaction might we use to synthesize nickel sulfate,niso4? Write equations for acid base neutralization. Include states in y
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Answer:

Here's what I get  

Explanation:

1. Nickel sulfate

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They react with acids to form carbonic acid (H₂CO₃), which decomposes into water and carbon dioxide.

\rm NiCO_{3}(s) + H_{2}SO_{4}(aq) \longrightarrow \, NiSO_{4}(aq) + H_{2}O(l) + CO_{2}(g)

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