Temperature Conversions An Approach to Problem Solving

Meters Kilometers Because 1000 m = 1 km, or 10 m = 1 km, we convert from meters to kilometers as follows  

B Remember that we are rounding off at the end of each step to show the correct number of significant figures. However, in doing a multistep calculation, you should retain the extra numbers that show on your calculator and round off only at the end of the calculation. 

Once you feel comfortable with the conversion process, you can combine the steps. For the above conversion, the combined expression is 

Note that the units cancel to give the required kilometers and that the result has three significant figures. 

Racing cars at the Indianapolis Motor Speedway now routinely travel around the track at an average speed of 225 mi/h. What is this speed in kilometers per hour  

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Yamamoto and co-workers reported abase- and ligand-free palladium (II) catalysed method, in methanol at room temperature and under air [49], While the conversion of arylboronic acids bearing an electro-donating group was very efficient, the presence of an electro-withdrawing substituent led to lower conversions. To solve this problem and also prevent the fast formation of palladium black, Yamamoto and co-workers described a new approach where the reaction was catalysed by NHC-bearing complexes 21 and 22 in the presence of an oxidant (Fig. 7.4) [50]. The best results were obtained when complex 21b was used in methanol at room temperature, in the presence of a small excess of p-benzoquinone. 

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