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Alex Ar [27]
3 years ago
12

How many molecules are present in 4.5 moles of H2O?

Chemistry
1 answer:
Gekata [30.6K]3 years ago
6 0

Answer:

Mole of the H2O = 4.5

Number of molecules =4.5 multipled by avogadro's number.

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The diameter of carbon atom is 0.000000000 154m. What is the number expressed in scientific notation
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one and fifty four-hundreths times ten to the power of negitiive 10
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Calculate the mass in grams of benzophenone required to make a solution of 2.5 mmoles
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Answer:

0.46 grams (C₆H₅)₂CO

Explanation:

To find the mass of benzophenone ((C₆H₅)₂CO), you need to (1) convert mmoles to moles and then (2) convert moles to grams (via molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units. The final answer should have 2 sig figs to match the sig figs of the given value (2.5 mmoles).

Molar Mass ((C₆H₅)₂CO): 13(12.011 g/mol) + 10(1.008 g/mol) + 15.998 g/mol

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2.5 mmoles (C₆H₅)₂CO               1 mole                  182.221 g
-----------------------------------  x  ------------------------  x  -------------------  =
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