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2 years ago

A student walks 3.0 hours and travels 6.0km what is the averge speed

Chemistry

1 answer:

saveliy_v [14]2 years ago

6 0

Answer:

2.0 km/hr

Explanation:

6.0 km/3.0 hrs

= 2.0 km/hr

Hope this helps! :3

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2 years ago

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If I make a salt solution that has 1 grams of salt and 9 grams of water the percentage of salt in my solution is _____.

Soloha48 [4]

Answer:

10%

Explanation:

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2 years ago

Standard 1.11 The blue and red parts of the atoms represent the?

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2 years ago

What is the molarity of a solution in which 250 grams of NaCl are dissolved in 2.9 L of water?

Maksim231197 [3]

Answer:

About 1.48 M.

Explanation:

The formula for molarity is mol/L.

So firstly, you must find the amount of moles in 250 grams of NaCl.

I do this by using stoichiometry. First, I find how nany grams are in a single mole of NaCl. This is around 58.44 grams/mole. Now that I know this, I can now use a stoich table. (250 g NaCl * 1 mol NaCl / 58.44 g NaCl). I plug this into my calculator.

I get that 250 grams of NaCl is equal to about 4.28 moles.

Now I just plug into the formula!

4.28 moles/2.9 L = about 1.48

I've attached a picture of my personal notes below which shows work I have done in similar equations.

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1 year ago

Outline the steps for a mass-mass stoichiometry problem.

yarga [219]

The answer is Make sure you are working with a properly balanced chemical equation.
Convert grams of the substance given in the problem to moles.
Construct two ratios - one from the problem and one from the chemical equation and set them equal. ...
Convert moles of the substance just solved for into grams. Step 1: Convert known reactant mass to moles. ...
Step 2: Use the mole ratio to find moles of other reactant. ...
Step 3: Convert moles of other reactant to mass. Balance the equation.
Convert units of a given substance to moles.
Using the mole ratio, calculate the moles of substance yielded by the reaction.
Convert moles of wanted substance to desired units.

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2 years ago