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
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>
oops, last line should read
to get 4.175 -23
is it A?
ok thx
To find the weight of 25 atoms of hydrogen, we need to multiply the mass of one atom of hydrogen by 25.
The given mass of 1 atom of hydrogen is 1.67 * 10^(-24) gram.
So, the weight of 25 atoms of hydrogen is:
(1.67 * 10^(-24) gram) * (25 atoms)
Multiplying the values:
1.67 * 25 * 10^(-24) gram
= 41.75 * 10^(-24) gram
= 4.175 * 10^(-23) gram
Therefore, 25 atoms of hydrogen weigh 4.175 * 10^(-23) gram.
Hence, the correct option is A. 4.175 * 10^(-23) gram.