What is the mass of 8.74 x 10 23 B atoms? Report your answer to two places past

Question

What is the mass of 8.74 x 1023 B atoms?
Report your answer to two places past the decimal point.
g
How many individual atoms are in a 37.0 g sample of Co?
To enter a number in scientific notation, remember to use the "enotation". For example, Avogadro's number would need to be enteredas 6.02e23. Note that there are no spaces. For a negative exponent,place the negative sign after the e, like in 6.02e-23 (no spaces).Numbers in scientific notation should be entered with at least twoplaces past the decimal point.
_________atoms
How many moles are represented by 1.56e+26 atom sample ofPt?
moles
What is the mass of 8.74 x 1023 B atoms?
Report your answer to two places past the decimal point.
g
How many individual atoms are in a 37.0 g sample of Co?
To enter a number in scientific notation, remember to use the "enotation". For example, Avogadro's number would need to be enteredas 6.02e23. Note that there are no spaces. For a negative exponent,place the negative sign after the e, like in 6.02e-23 (no spaces).Numbers in scientific notation should be entered with at least twoplaces past the decimal point.
_________atoms
How many moles are represented by 1.56e+26 atom sample ofPt?
moles

Explanation / Answer

a) 8.74 e23 B atoms *(10.81 g / 6.022 e23 B atoms) = 15.69 grams b) 37.0g Co *(6.022 e23 Co atoms/58.93 g) = 3.78e23 atoms c) 1.56 e 26 atom *(1 mol/ 6.022 e23 atoms) = 259 moles

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