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3 years ago

Select all that are True.

Chemistry

1 answer:

givi [52]3 years ago

4 0

Answers a
Explanation
Because it removes all the energy in the form of heat

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Use the periodic table to help you.

BARSIC [14]

The answer would be Sb
Because N P and O are all non metals whereas Sb is a metal

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4 years ago

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My sporty mini van needs 19,126 kJ of energy in order to pass a fast moving street sweeper on the road. Using the following equa

nika2105 [10]

Answer:

$m=397.6gC_8H_{18}}$

Explanation:

Hello there!

In this case, according to the given chemical reaction, we can set up the heat of reaction per mole of gasoline as shown below:

$\Delta H=\frac{-10,990kJ}{2molC_8H_{18}}=-5495\frac{kJ}{molC_8H_{18}}$

Now, since the total heat is obtained by multiplying the moles and heat of reaction, we can calculate the moles as shown below:

$n=\frac{Q}{-\Delta H } \\\\n=\frac{19,126kJ}{-(-5495\frac{kJ}{molC_8H_{18}} )} \\\\n=3.48molC_8H_{18}}$

Finally, since the molar mass of gasoline is 114.22 g/mol, we can easily calculate the mass as follows:

$m=3.48molC_8H_{18}} *\frac{114.22gC_8H_{18} }{1molmolC_8H_{18}} } \\\\m=397.6gC_8H_{18}}$

Best regards!

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3 years ago

Which is the electron configuration for nobelium (No)?

marishachu [46]

It’s [Xe]7s^2 5f^14 (first one) hopefully i could help!!

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3 years ago

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How many atoms are present in a sample of Potassium (K) weighing 33.49g?

madam [21]

Answer:

5.158 × 10²³ atoms K

General Formulas and Concepts:

Chemistry - Atomic Structure

Reading a Periodic Table
Using Dimensional Analysis
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Explanation:

Step 1: Define

33.49 g K

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of K - 39.10 g/mol

Step 3: Convert

$33.49 \ g \ K(\frac{1 \ mol \ K}{39.10 \ g \ K} )(\frac{6.022 \cdot 10^{23} \ atoms \ K}{1 \ mol \ K} )$ = 5.15797 × 10²³ atoms K

Step 4: Check

We are given 4 sig figs. Follow sig figs and round.

5.15797 × 10²³ atoms K ≈ 5.158 × 10²³ atoms K

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3 years ago

In this experiment, you will measure all masses in

Xelga [282]

Answer:

0.498 kg

Explanation:

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3 years ago