并不是翻译题 所以不需要给我翻译出来～
问题描述：
并不是翻译题 所以不需要给我翻译出来～
1)One of the first mixtures of metals,called amalgams,used by dentists for tooth fillings consisted of 26.0gof silver,10.8g of tin,2.4g of copper,and 0.8g of zinc.How much silver is in a 25.0g sample of this amalgam?
2)there are 7.0 x 10^6red blood cells(RBC) IN 1.0mm^3 of blood.How many red blood cells are in 1.0L of blood?
3)Gold has a density of 19.3g /cm^3.what is the density in kilograms per cubic meter?
答
1 26/（26+10.8+2.4+0.8=15）*25=16.25克
2 7*10^6*1000000=7.0*10^12
3 19.3*1000000/1000=19300KG/M^3