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ValentinkaMS [17]
3 years ago
5

A potted plant is placed under a grow lamp, which provides 6,400 J of energy to the plant and the soil over the course of an hou

r. The specific heat capacity of the soil is about 0.840 J/g°C and the temperature goes up by 9.25°C of soil. How many grams of soil are there?
Chemistry
2 answers:
STatiana [176]3 years ago
8 0

Answer:

823.7g

Explanation:

Using the formula as follows:

Q = m × c × ∆T

Where;

Q = amount of heat (J)

m = mass of substance (g)

c = specific heat capacity (J/g°C)

∆T = change in temperature (°C)

Using the information given in this question as follows:

Q = 6,400 J

m = ?

c of soil = 0.840 J/g°C

∆T = 9.25°C

Using Q = mc∆T

m = Q ÷ c∆T

m = 6,400 ÷ (0.840 × 9.25)

m = 6400 ÷ 7.77

m = 823.7g

lina2011 [118]3 years ago
3 0

Answer:

There are 823.68 grams.

Explanation:

Calorimetry is responsible for measuring the amount of heat generated or lost in certain physical or chemical processes.

Between heat and temperature there is a relationship of direct proportionality. The constant of proportionality depends on the substance that constitutes the body and its mass, and is the product of the specific heat by the mass of the body. In summary, the amount of heat Q that receives or transmits a mass m of a substance with specific heat C to raise its temperature from T1 to T2 is given by the formula:

Q= C*m* (T2- T1) = C*m* ΔT

In this case:

  • Q= 6400 J
  • C= 0.840 \frac{J}{g*C}
  • m= ?
  • ΔT= 9.25 C

Replacing:

6400J= 0.840 \frac{J}{g*C} *m* 9.25 C

Solving:

m=\frac{6400 J}{0.840 \frac{J}{g*C} *9.25 C}

m=823.68 grams

<u><em>There are 823.68 grams.</em></u>

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An extra-strength aspirin contains 0.500 g of aspirin. how many grains is this? (1grain=64.8mg)
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By unit conversion, the aspirin contains 7.72 grains.

We need to know about unit conversion to solve this problem. The unit conversion can be used to convert a unit to another unit. It can be defined as

a = xb

where a is unit a, b is unit b and x is the constant of conversion.

From the question above, we know that

m = 0.5 gram

unit conversion

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Convert the unit conversion to 1 mg

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1/64.8 grain = 64.8/64.8 mg

1 mg = 1/64.8 grain

Convert the aspirin mass to grain

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