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Vera_Pavlovna [14]
2 years ago
6

what is the molarity of a solution prepared by dissolving 54.3 g of ca(no3)2 to form 355 ml of the solution?

SAT
1 answer:
Ratling [72]2 years ago
6 0

Answer:

The molarity of a solution prepared by dissolving 54.3 g of Calcium nitrate  into 355 mL of water is 0.9881M

Molarity of solution is the ratio of the number of moles of the substance to the volume.

n is the number of moles of the compound

Mass of calcium nitrate = 54.3g

Molar mass of calcium nitrate = Ca(NO₃)₂ = 164.088 g/mol

Get the required molarity;

Hence the molarity of a solution prepared by dissolving 54.3 g of Calcium nitrate  into 355 mL of water is 0.9881M

Explanation:

:)

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Answer:

Thomas Edison

Explanation:

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3 years ago
Lucy is knitting a blanket and needs to buy some more yarn. At her local craft store, 2 skeins of yarn cost $7 and 8 skeins of y
dybincka [34]

Answer:

It will cost $70.

Explanation:

$7/2 skeins = $3.50

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2 years ago
A manufacturer of potato chips would like to know whether its bag filling machine works correctly at the 426 gram setting. Based
Blababa [14]

The conclusion of the research is that we reject the null hypothesis and we conclude that the bag filling machine does not work correctly at the 426 gram setting.

<h3>How to solve hypothesis testing?</h3>

We are given;

Population Mean; μ = 426

Sample mean; x' = 433

Sample size; n = 13

Standard deviation; s = 29

significance level; α = 0.05

Let us define the hypotheses;

Null Hypothesis; H₀: μ = 426 g

Alternative Hypothesis; H_a: μ < 426 g

Formula for the z-score here is;

z = (x' - μ)/(s/√n)

z = (433 - 426)/(29/√13)

z = 0.87

From online p-value from z-score calculator, we have;

p-value =  0.1922

This p-value is greater than the significance value and as such we reject the null hypothesis and we conclude that the bag filling machine does not work correctly at the 426 gram setting.

Read more about Hypothesis testing at; brainly.com/question/15980493

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7 0
2 years ago
Select the correct answer. Read the description and select the course described. Es lo que primero se ofrece en el menú. Son peq
ollegr [7]

The correct option for the statement in Spanish 'es lo que primero se ofrece en el menú' is 'aperitivo'. The word 'aperitivo' in English means appetizer.

An appetizer is a small dish containing food or a small drink served before a meal in order to stimulate appetite.

In consequence, an appetizer can be a light snack taken before the main meal.

Some examples of well-known appetizers include, among others, Chicken Enchilada Dip, Cowboy Caviar, Scallion, Caramelized Onion Dip, etc.

Learn more about appetizers here:

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4 0
3 years ago
3x – 4y = 10<br> 2x – 4y = 6<br> what is the value of y?
Lorico [155]

3x- 4y=10

10÷1=10

Therefore y is equal to 10

3 0
2 years ago
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