like all equilibrium constants, the value of kw depends on temperature. at body temperature (37∘c), kw=2.4×10−14.

SAT

1 answer:

DENIUS [597]2 years ago

5 0

Answer:

The concentration of [ H3O^+] is 1.6 × 10^−7.

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Mrs. Grayson the much loved teacher of first grade retired last year

pickupchik [31]

Answer:

Mrs. Grayson, the much loved teacher of first grade, retired last year.

Explanation:

The subject of this sentence is Mrs. Grayson, and the sentence says she retired last year at age seventy two. "The much loved teacher" describes Mrs. Grayson, and should have a comma after (and before it).

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3 years ago

Newton’s law of cooling states that for a cooling substance with initial temperature t0, the temperature t(t) after t minutes ca

antoniya [11.8K]

The cooling rate of the substance is approximately 0.0732.

According to the statement, the Newton's law of cooling is defined by the following formula:

$T(t) = T_{s} + (T_{o}-T_{s})\cdot e^{-k\cdot t}$ (1)

Where:

$T_{s}$ - Final temperature, in degrees Celsius.
$T_{o}$ - Initial temperature, in degrees Celsius.
$t$ - Time, in minutes.
$k$ - Cooling rate, in $\frac{1}{min}$ .
$T(t)$ - Current temperature, in degrees Celsius.

Please notice that substance reaches thermal equilibrium when $T(t) = T_{s}$ , that is when temperature of the substance is equal to the temperature of surrounding air.

If we know that $T_{o} = 80\,^{\circ}C$ , $t = 15\,min$ , $T_{s} = 50\,^{\circ}C$ and $T(15) = 60\,^{\circ}C$ , then the cooling rate of the substance is: