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11111nata11111 [884]
2 years ago
11

Xg 4Na + 15g 02 → 70g 2Na20

Chemistry
1 answer:
aleksley [76]2 years ago
6 0

Answer: 43.125g

Explanation:4Na+ O2=2Na2O

Molar mass: 23. 32. 62. React.mass: 92.

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Geologists may choose to lick a mineral to identify it. What mineral is the geologist expecting with this test?
Archy [21]
<span>NaCl (halite) or KCl (sylvite) </span>
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During which two processes does a substance release energy?
enyata [817]

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Freezing and condensation

Explanation:

Because they are exothermic, they release energy

6 0
2 years ago
In what type of ratios do atoms combine to form compounds
serious [3.7K]

Answer: whole number ratios

Explanation:

Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Copper (Cu)

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass. It can be decomposed into simpler constituents using chemical reactions. Example: water (H_2O)

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3 years ago
Expressed in the correct number of significant figures the sum of 0.53 cm + 75.321 cm + 28.1 cm =
Nadya [2.5K]

Answer:

\boxed{\text{104.0 cm}}

Explanation:

When adding or subtracting values, you must round your answer to the same "place" as the measurement with its last significant figure furthest to the left.  

That is, you round off to the same number of decimal places as the measurement with the fewest decimal places.

\begin{array}{r|l}0.5& \text{3 cm}\\+ 75.3& \text{21 cm}\\+ 28.1 & \quad\text{cm} \\= 103.9 &\text{51 cm}\\\end{array}

The measurement of 28.1 cm has one digit after the decimal point, so you round the sum to have only one digit to the right of the decimal.

However, the number to be dropped (51) is greater than 5 with only zeros or nothing following the 5.

You must round up the answer. You increase the last significant digit by one.

\text{The sum is $\boxed{\textbf{104.0 cm}}$}

5 0
3 years ago
Two substances that have the same number of moles of representative particles always have:
shusha [124]
Two substances that have the same number of moles of representative particles always have:
none of these are correct
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3 years ago
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