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OpenStudy (anonymous):
new in chemistry---In 3.45mg of boron there are how many of the following? grams of boron? moles of boron? boron atoms?
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OpenStudy (anonymous):
grams of boron= are you sure its not 3.45 grams? because then it quite simply that, otherwise its 0.00345g of boron. moles of boron = mass/molar mass = 0.00345/10.81 = 0.000319148 moles boron atoms - 6.02x10^23x0.00345 = 2.076x10^21
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