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1 year ago

14

How many ethnic groups are there in China?

2 answers:

Murljashka [212]1 year ago

6 0

Answer:

There are a total of 56 ethnic groups in China, with 56 ethnic groups and 56 family members.

Explanation:

There are a total of 56 ethnic groups in China, with 56 ethnic groups and 56 family members.

ehidna [41]1 year ago

5 0

China is a united multi-ethnic nation of 56 ethnic groups. As the majority (91.6 percent) of the population is of the Han ethnic group, China's other 55 ethnic groups are customarily referred to as ethnic minorities.

There’s your answer

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What would be the mass of 3 moles of water molecules?

ankoles [38]

Answer:

$\boxed {\boxed {\sf A. \ 54 \ grams }}$

Explanation:

To convert from moles to grams, we must use the molar mass.

Recall that water's molecular formula is H₂O. It contains hydrogen and oxygen. Look up the two elements masses on the Periodic Table.

Hydrogen (H): 1.008 g/mol
Oxygen (O): 15.999 g/mol

Now, use these masses to find water's mass. The subscript of 2 tells us there are 2 atoms of hydrogen, so we multiply hydrogen's mass by 2 and add oxygen's.

H₂O= 2(1.008 g/mol) + 15.999 g/mol = 18.015 g/mol

Use the molar mass as a ratio.

$\frac{18.015 \ g \ H_2 O}{ 1 \ mol \ H_2 O}$

Multiply by the given number of moles.

$3 \ mol \ H_2O*\frac{18.015 \ g \ H_2 O}{ 1 \ mol \ H_2 O}$

The moles of water will cancel.

$3 *\frac{18.015 \ g \ H_2 O}{ 1 }$

$3 *{18.015 \ g \ H_2 O}$

$54.045 \ g \ H_2O$

Round to the nearest whole number. The 0 in the tenth place tells us to leave the number as is.

$54 \ g \ H_2O$

There are about <u>54 grams</u> of water in 3 moles.

7 0

2 years ago

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Which elements are metals? check all that apply. rhenium (re) boron (b) lithium (li) krypton (kr) phosphorus (p) mercury (hg)?

tangare [24]

Lithium, mercury, and rhenium are all metals.

4 0

3 years ago

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Which statement about Niels Bohr’s atomic model is true?

jenyasd209 [6]

Answer:

Each orbit has a specific energy level.

Would you mind marking it the brainliest:).

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2 years ago

Cells get energy from food to sustain the life of the organism.

Sati [7]

The answer is B hope this helped

4 0

2 years ago

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What is the value for ∆Soreaction for the following reaction, given the standard entropy values? 2H2S(g) + SO2(g) 3Srhombic(s) +

Mademuasel [1]

Answer: $\Delta S^{0}$ for the reaction is -186.75 J/K

Explanation:

Change in entropy ( $\Delta S^{0}$ ) for the given reaction under standard condition is given by-

$\Delta S^{0}$ = $[3\times S_{rhombic}^{0}_{(s)}]+[2\times S_{H_{2}O}^{0}_{(g)}]-[2\times S_{H_{2}S}^{0}_{(g)}]-[1\times S_{SO_{2}}^{0}_{(g)}]$

So $\Delta S^{0}$ = $[3\times 31.8 J/K.mol]+[2\times 188.825 J/K.mol]-[2\times 205.79 J/K.mol]-[1\times 248.22 J/K.mol]$ = -186.75 J/K

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2 years ago