3 years ago

A student has the following data recorded: final readings: 760. mm Hg, 6.0L, 197 'C. initial readings:

Chemistry

1 answer:

irina [24]3 years ago

7 0

Is that Geometry or Algebra?

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How much sucrose (g) do you need to weight in order to prepare 19.16 g of a 13.1 % (weight percent) solution?

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<span>2.51 grams
You want to prepare 19.16 g of some solution which will have 13.1% of it's mass being sucrose. So we just need to perform some simple multiplication: 19.16g * 0.131 = 2.50996g
Rounding to 3 significant figures gives 2.51 g.</span>

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3 years ago

What is the mass of 2.50 moles of potassium chlorate in grams

Sedaia [141]

Answer: 306 grams are there in 2.50 moles of potassium chlorate

Explanation

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

given mass of potassium chlorate = ?

Molar mass of potassium chlorate = 122.55 g/mol

Putting in the values we get:

$2.50=\frac{xg}{122.55g/mol}$

$x=2.50mol\times 122.55g/mol=306g$

306 grams are there in 2.50 moles of potassium chlorate

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How to balance this equation: <br> Cu(s) + O2(g) --> CuO(s)

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2Cu(s) + O2(g) --> 2CuO(s)

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Gretchen wants to run a test to discover whether glass, copper, wood, or plastic conduct electricity. She sets up a circuit conn

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Battery,and i think the light bulb because it depends how much energy the light bulb needs

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