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2000 kg. (unless the m in mg is actually a capital M)
m = 10^-3 0,5 mg = 0,5 * 10^-3 mg = 0,0005 mg
You have : m = ( 4.3 g ) ( 1000 mg / g ) = 4300 mg <---------------------------
m means 'milli'. This is short for thousandth. Therefore there is 1000 mg in 1g. Therefore 2000 mg is equal to 2 g