Asked by hawseefoo
the mass of 1 atom of hydrogen is 1.67 * 10^(-24) gram. how much do 25 atoms of hydrogen weigh?
A. 4.175 * 10^(-23) gram
B. 4.175 * 10^(-25) gram
C. 6.68 * 10^(-22) gram
D. 6.68 * 10^(-26) gram
A. 4.175 * 10^(-23) gram
B. 4.175 * 10^(-25) gram
C. 6.68 * 10^(-22) gram
D. 6.68 * 10^(-26) gram
Answers
Answered by
Reiny
25 * 1.67 * 10^(-24)
= 41.75 * 10^-24
= 4.175 * 10^-23
most scientific calculators can easily handle
operations with scientific notation numbers.
look for a key labeled : Exp
On mine, I could have done this:
1.67, Exp, 24, ± , =, x, 25, =
to get 4.175 <super> -23 </super>
= 41.75 * 10^-24
= 4.175 * 10^-23
most scientific calculators can easily handle
operations with scientific notation numbers.
look for a key labeled : Exp
On mine, I could have done this:
1.67, Exp, 24, ± , =, x, 25, =
to get 4.175 <super> -23 </super>
Answered by
hawseefoo
so witch answer is it
Answered by
Reiny
oops, last line should read
to get 4.175 <sup> -23 </sup>
to get 4.175 <sup> -23 </sup>
Answered by
hawseefoo
is it A?
Answered by
hawseefoo
ok thx
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