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natima [27]
3 years ago
12

The compound nickel (III) chloride dihydrate has ____ mole(s) of water for every ____ mole(s) of ionic compound.

Mathematics
1 answer:
Arisa [49]3 years ago
8 0
<span>The compound nickel (III) chloride dihydrate has two moles of water for every one mole of ionic compound.
In each mole of ionic compound, there are two moles of water in this compound. </span>
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Serga [27]

Answer:

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Step-by-step explanation:

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Evaluate the integral e^xy w region d xy=1, xy=4, x/y=1, x/y=2
LUCKY_DIMON [66]
Make a change of coordinates:

u(x,y)=xy
v(x,y)=\dfrac xy

The Jacobian for this transformation is

\mathbf J=\begin{bmatrix}\dfrac{\partial u}{\partial x}&\dfrac{\partial v}{\partial x}\\\\\dfrac{\partial u}{\partial y}&\dfrac{\partial v}{\partial y}\end{bmatrix}=\begin{bmatrix}y&x\\\\\dfrac1y&-\dfrac x{y^2}\end{bmatrix}

and has a determinant of

\det\mathbf J=-\dfrac{2x}y

Note that we need to use the Jacobian in the other direction; that is, we've computed

\mathbf J=\dfrac{\partial(u,v)}{\partial(x,y)}

but we need the Jacobian determinant for the reverse transformation (from (x,y) to (u,v). To do this, notice that

\dfrac{\partial(x,y)}{\partial(u,v)}=\dfrac1{\dfrac{\partial(u,v)}{\partial(x,y)}}=\dfrac1{\mathbf J}

we need to take the reciprocal of the Jacobian above.

The integral then changes to

\displaystyle\iint_{\mathcal W_{(x,y)}}e^{xy}\,\mathrm dx\,\mathrm dy=\iint_{\mathcal W_{(u,v)}}\dfrac{e^u}{|\det\mathbf J|}\,\mathrm du\,\mathrm dv
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3 years ago
An airplane is preparing to land at an airport. It is 50400 feet above the ground and is descending at the rate of 3000 feet per
Dovator [93]

Answer:

let t = no of minutes when they are at the same altitude

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52200 - 3300t = 2500t

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The altitude:

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Check on other train

52200 - 9(3300) =

52200 - 29700 = 22500 ft

3 0
2 years ago
What is 7/8 - 4/7 as a fraction
motikmotik

Answer:

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7/8 - 4/7 = 17/56

4 0
3 years ago
Read 2 more answers
Proportions - if 1 subscription costs $21, how much is 28 subscriptions?
Len [333]
1 subscription = $21
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You know 1 subscription is $21
You want to find out how much 28 subscriptions are
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If you would like the formula to find out how many subscriptions cost hat amount of money,
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