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Some Basic Concepts Of Chemistry

Question
CBSEENCH11008021
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What will be the mass of one straight C presuperscript 12 atom in g?

Solution

1 mol of straight C presuperscript 12 atoms  = 6.022 space straight x space 10 to the power of 23 space atoms = 12 g
 6.022 space cross times space 10 to the power of 23 space atoms space of space straight C presuperscript 12 space atoms space have space mass space equals space 12 straight g space space space therefore space space space space 1 space atoms space of space straight C presuperscript 12 space atom space would space have space mass space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator 12 straight g over denominator 6.022 cross times 10 to the power of 23 end fraction space equals space 1.9927 space cross times space 10 to the power of negative 23 end exponent straight g

Some More Questions From Some Basic Concepts of Chemistry Chapter

What is the number of significant figures in 0.0026?

What is the number of significant figures in 9.984?

Express the Avogadro's number (6·023×1023) upto three significant figures.

What is the result of (5.472 - 1.12) to the appropriate number of signficant figures?

Express 0.0468 in scientific notation.

What does SI units stand for?

What is the relation between temperature in Kelvin (K) and temperature on centigrade scale?

The popular unit of pressure is atmosphere, how is it related to pascal?

What are SI units of the following:

(i) Density    
(ii) Molarity          
(iii) Energy    
(iv) Temperature ?

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