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chemistry

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consider a random mixture of two particles,diamond and SiC.Assume all particles are spherical with a radius of 0.100mm. The mixture is 80.0 wt% diamond(density=3.51 g/ml) and 20.0 wt% SiC (density=3.23 g/ml)
a)Calculate the mass of a single particle diamond and the number of particles in 1.00 g of this mixture
b)Calculate the relative sampling standard deviation in the number of particles of each type in a sample size of 1.00g and 10.0 mg
i used sn=SQR(Npq) formula

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