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3 years ago

Plz help me with this question

Chemistry

1 answer:

Mazyrski [523]3 years ago

4 0

Cars rust because when metal comes into contact with water or some sort of water form, it will make the surface wet. If the metal is wet for too long, it will start to soak up the water, therefore making it rusty. The salt will also rust a car. It does this because the mix of carbon dioxide and oxygen in the salt will eat away at the car, making it rust faster. Hope this helps!

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4 years ago

Read 2 more answers

We have an aqueous solution that contains 29% (by mass) of a hypothetical solute Z. The formula weight of the solute Z is 242 g/

malfutka [58]

Answer:

The molarity of Z in this solution is 1.80 mol/L

Explanation:

29% (by mass) means that in 100 g of solution, you have 29 grams of solute.

So, by the solution density we can find our volume.

Density = mass / volume

Solution density = mass solution / volume solution

1.5 g/ml = 100 g / volume solution

volume solution = 100 g/ 1..5 g/ml

volume solution = 66.6 mL

So we have just found out that in 66.6 mL, we have 29 g of solute Z, so if we want to know the molarity, we have to find out the mass in 1 L, and afterwards, calculate the moles, we have

1000 mL = 1L

66.6 mL ____ 29 g of solute Z

1000 mL ____ (29 g . 1000 mL)/ 66.6 mL = 435.4 g

With the molar mass (formula weight), we can find out the moles

Mass /Molar mass = Mol

435.4 g /242 g/m = 1.80 mol

Molarity is 1.80 mol/L

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3 years ago