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Mumz [18]
3 years ago
11

An unknown element, X, reacts with sodium to form the compound Na2X. In other compounds, this element also can accommodate up to

12 electrons rather than the usual octet. What element could X be?
A. Sr
B. O
C. Cl
D. Po
Chemistry
1 answer:
Andreas93 [3]3 years ago
7 0

Answer:

B. O

Explanation:

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Calculate the mass of water having same number of hydrogen atoms as are present in the 32gram of methane. Please help me soon...
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Answer:

Explanation:

1 mole of methane = C + H4 = 12 + 4 = 16

32 grams of methane is 32/16 = 2 moles.

1 moles of methane contains 4 moles of hydrogen (CH4). Note the 4 in CH4

2 moles of methane = 8 moles of hydrogen.

H2O has 2 moles of hydrogen

Each mole of water contains 2 moles of hydrogen.

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Choose all of the answers that describe beneficial microorganisms.
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2 years ago
The heat of fusion for a substance is 122 joules per gram. How many joules of heat are need to melt 7.50 grams of this substance
daser333 [38]
<h3>Answer:</h3>

915 Joules

<h3>Explanation:</h3>
  • The heat of fusion is the heat that is required to convert a given mass of a substance from solid state to liquid state without change in temperature.
  • In this case, we are given specific heat of a substance as 122 joules per gram
  • It means that amount of heat equivalent to 122 joules is required to change 1 gram of the substance from solid state to liquid state.
  • Therefore, we can determine the amount of heat needed to change 7.5 grams of the substance from solid to liquid state.

1 g = 122 Joules

7.5 g = ?

       = 122 × 7.5

      = 915 Joules

Thus, 7.5 g of the substance at its melting point will require 915 Joules of heat to melt.

4 0
3 years ago
Please help me ASAP!!!!!!!!!
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Explanation:

chemical analysis of a compound shows that it contains 0.99g lead ,0.154g sulfur and 0.306g oxygen. what is the empirical formula of the compound.

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