$19.7 \ kg$ of gold was recovered from a smuggler. How many atoms of gold were recovered? (Atomic mass of $Au = 197 \ g/mol$)
- A$100$
- B$6.02 \times 10^{23}$
- C$6.02 \times 10^{24}$
- D$6.02 \times 10^{25}$
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The number of gram molecules of chlorine in $6.02 \times 10^{25}$ hydrogen chloride molecules is
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View SolutionThe molar mass of $CO_2$ is $44 \ g/mol$. Given that the Avogadro constant is $6.022 \times 10^{23} \ mol^{-1}$,the mass of one molecule of $CO_2$ is ..... $\times 10^{-23} \ g$.
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View SolutionMatch the items in Column-$A$ with the items in Column-$B$ and select the correct option.
Column-$A$ Column-$B$ $1$. $55.55 \text{ mol}$ $(P)$ $6.022 \times 10^{23}$ molecules of sucrose $2$. $2 \text{ mol}$ $(Q)$ $1.8 \text{ g}$ of $H_2O$ $3$. $0.1 \text{ mol}$ $(R)$ $126 \text{ g}$ of $HNO_3$ $4$. $0.01 \text{ mol}$ $(S)$ $1 \text{ L}$ of pure water
| Column-$A$ | Column-$B$ |
| $1$. $55.55 \text{ mol}$ | $(P)$ $6.022 \times 10^{23}$ molecules of sucrose |
| $2$. $2 \text{ mol}$ | $(Q)$ $1.8 \text{ g}$ of $H_2O$ |
| $3$. $0.1 \text{ mol}$ | $(R)$ $126 \text{ g}$ of $HNO_3$ |
| $4$. $0.01 \text{ mol}$ | $(S)$ $1 \text{ L}$ of pure water |
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View SolutionIf $100 \ mL$ of a urea solution contains $6.022 \times 10^{20}$ molecules,what is the concentration of the urea solution in $M$?
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