2 years ago

What is the percent nitrogen in NaNO3? 56.47% 27.04% 16.48% 14.01%

Chemistry

1 answer:

hichkok12 [17]2 years ago

3 0

I think it’s :answer choice c

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How would you prepare 100 ml of 0.4 M MgSO4 from a stock solution of 2 M MgSO4?

miss Akunina [59]

OK, so to answer this question, you will simply use the molality equation which is as follows:
M1V1 = M2V2
In the givens you have:
M1 = 2M
V1 is the unknown
M2 = 0.4M
V2 = 100 ml

plug in the givens in the above equation:
2 x V1 = 0.4 x 100
therefore:
V1 = 20 ml

Based on this: you should take 20 ml of the 2 M solution and make volume exactly 100 ml in a volumetric flask by diluting in water.

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3 years ago

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Pavlova-9 [17]

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4 years ago

Consider two liquids, labeled A and B, that are both pure substances. Liquid A has

Scrat [10]

E is the correct answer

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3 years ago

How many grams of zinc chloride could be formed from the reaction of 3.57g of zinc with excess HCl?

lorasvet [3.4K]

MZn: 65 g/mol
mZnCl₂: 65g+35,5g×2 = 136 g/mol
.....................
Zn + 2HCl -----> ZnCl₂ + H₂
65g.......................136g............

65g Zn ---- 136g ZnCl₂
3,57g Zn ---- X
X = (3,57×136)/65
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4 years ago

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Scintillatium has a halflife of 16 minutes. if a sample has 800 grams, find a formula for its mass after t minutes.

hichkok12 [17]

Halflife is the time needed for a radioactive molecule to decay half of its current mass. If t is the time elapsed, the formula for the halflife would be:
final mass= original mass * $\frac{1}{2} ^{\frac{t}{halflife}$

If you put the information of the problem into the formula, the equation will be:
final mass= original mass * $\frac{1}{2} ^{\frac{t}{halflife}$
final mass= 800g * $\frac{1}{2} ^{\frac{t}{16 min}$

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3 years ago