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Some Basic Concepts Of Chemistry

Question
CBSEENCH11005031
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What is the name of the element whose mass of one atom is 4×10–23. Given Avogadro’s number as 6×1023.

Solution

One atom of an element weighs
                                          equals space 4 cross times space 10 to the power of negative 23 end exponent straight g
therefore space space space 6 space cross times space 10 to the power of 23 space atoms space of space an space element space would space weigh 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 space 4 space cross times space 10 to the power of negative 23 end exponent cross times 6 cross times 10 to the power of 23 straight g space equals space 24 space straight g therefore space Gram space atomic space mass space of space the space element space space equals space 24 space straight g or space space space space space space space space Atomic space mass space of space the space element space equals space 24 space straight g therefore space space space Name space of space the space element space is space magnesium.

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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