Q32 of 75 Page 81

Calculate the number of moles in 360 g of this gas sample.

[Given, atomic masses of C = 12 u, O = 16 u, NA = 6.022 × 1023 per mole]

Given:


Mass of gas = 360g


Molar mass = 44g/mol


To calculate the number of moles, we apply the formula:



⇒


⇒ Number of moles = 8.1mol


Thus, the number of moles in 360g of the sample is 8.1


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[Given, atomic masses of C = 12 u, O = 16 u, NA = 6.022 × 1023 per mole]

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[Given, atomic masses of C = 12 u, O = 16 u, NA = 6.022 × 1023 per mole]

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Jyoti buys a gold jewellery which has 90% gold and the rest copper. She is given a bill which charges amount equivalent to 100% of gold. She argues with seller about the discrepancy, who settles the bill accordingly.

(i) What is the ratio of gold and copper in the jewellery?


(ii) How many atoms of gold are present in 1g of it?


(iii) What are the values displayed by Jyoti?