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Brilliant_brown [7]

3 years ago

11

A solution is prepared by dissolving 98.6 g of nacl in enough water to form 875 ml of solution. calculate the mass % of the solu

tion if the density of the solution is 1.06 g/ml.

1 answer:

Crank3 years ago

7 0

I'm guessing <span>10.6% based on the following information:
</span>
Mass soln = <span>density×volume=1.06×875=927.5<span>g
</span></span><span><span>M<span>NaCl/</span></span><span>Msoln</span></span>×100=<span>%M
which means this:
</span>

%M=98.6927.5×100=10.6

<span>Was this helpful? I hope so.</span>

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For this triangle...?

Mariulka [41]

<h3><u>Answer</u>;</h3>

= 0.6

<h3><u>Explanation</u>;</h3>

Using Pythagoras theorrem

Base² + height ² = Hypotenuse²

Thus;

Base² = 15² - 12²

= 81

Base = √81 = 9

But; cosine = adjacent/hypotenuse

Hence; cos θ = 9/15

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3 years ago

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A gas cloud surrounds a dying star against a dark background. The star heats the gases in the cloud. What type of spectrum would

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There are several different types of spectrums that you could expect to find from
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3 years ago

The period of a pendulum is measured 16 times. The average value of the period over these 16 trials is calculated to be 1.50 sec

marin [14]

Answer:

The additional trials needed is 48 trials

Explanation:

Given;

initial number of trials, n = 16 trials

the standard deviation, σ = 0.24 s

initial standard error, ε = 0.06 s

The standard error is given by;

$\epsilon = \frac{\sigma}{\sqrt{n} }$

To reduce the standard error to 0.03 s, let the additional number of trials = x

$0.03= \frac{0.24}{\sqrt{n+x} } \\\\0.03= \frac{0.24}{\sqrt{16+x} }\\\\0.03\sqrt{16+x} = 0.24\\\\\sqrt{16+x} = \frac{0.24}{0.03} \\\\\sqrt{16+x} = 8\\\\16+x = 8^2\\\\16+x = 64\\\\x = 64 -16\\\\x = 48 \ trials$

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3 years ago

In deep space, there is very little friction. Once they launch a probe into deep space, where there are no external forces actin

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Answer:

move at constant velocity.

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In the case of the probe, friction in deep space is negligible, therefore when the engine is shut down, there are no more forces acting on the probe: the net force therefore will be zero, so the probe will move at constant velocity.

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11) A man is on a 1/4 on a bridge. A train is coming the same direction he is going. The man can run across the bridge in the sa

lesya692 [45]

15mph

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Since the train's speed is known to be 60 mph, this means that

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7 0

3 years ago