3 years ago

Determine the number of moles of 35.4 grams of Magnesium.

Chemistry

1 answer:

dezoksy [38]3 years ago

5 0

Answer:

<u>1.46 moles</u>

Explanation:

You need to multiply 35.4g by Magnesium's molar mass.

Molar mass =1 mole/24.305g

(35.4g)(1 mole Mg/24.305g)= 1.46 moles <- rounded to 3 significant figures

As you can see, grams cancel out and you're left with moles.

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What is the molarity of the potassium hydroxide if 25.25 mL of KOH is required to neutralize 0.500 g of oxalic acid, H2C2O4? H2C

Greeley [361]

Answer:

0.444 mol/L

Explanation:

First step is to find the number of moles of oxalic acid.

n(oxalic acid) = $\frac{0.5g}{90.03 g/mol} = 5.5537*10^{-3} mol\\$

Now use the molar ratio to find how many moles of NaOH would be required to neutralize $5.5537*10^{-3} mol\\$ of oxalic acid.

n(oxalic acid): n(potassium hydroxide)

1 : 2 (we get this from the balanced equation)

$5.5537*10^{-3} mol\\$ : x

x = 0.0111 mol

Now to calculate what concentration of KOH that would be in 25 mL of water:

$c = \frac{number of moles}{volume} = \frac{0.0111}{0.025} = 0.444 mol/L$

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3 years ago

which change in the temperature of the one gram sample of water would cause the greatest increase in average kinetic energy of i

LenaWriter [7]

Maybe about in the 50ths

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4 years ago

How many neon atoms are contained in (7.27x10^2) grams of neon?

statuscvo [17]

Answer: 2.19x10^25 atoms

Explanation:

Molar Mass of Neon = 20g/mol

1mole(20g) of Neon contains 6.02x10^23 atoms.

Therefore, 7.27x10^2g of Neon will contain x atoms i.e

X atoms = (7.27x10^2x6.02x10^23)/20 = 2.19x10^25 atoms

4 0

3 years ago

If element X has 65 protons, how many electrons does it have

Tomtit [17]

In an atom there are the same number of protons as electrons to start with. The answer would be 65 aswell.

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3 years ago

Read 2 more answers

If I(to study),I(to pass)the exams

Thepotemich [5.8K]

If I study, I will pass the exams.

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2 years ago