Zariiiiidn
Answered

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1. Suppose there are 602 000 000 000 000 000 000 atoms in one mole of

hydrogen, how many atoms are there in 7 moles of hydrogen? To avoid too

much space, write your answer in scientific notation.

2. A light year is the distance that light travels in a year. It is approximately

9 460 800 000 km. If it takes about 3 years for light to travel from a certain star to

Earth, how many kilometers is this star from Earth?​

Sagot :

Suzette52idn

Answer:

1.

[tex](6.02 \times 10 {}^{20})(7) = 4214000000000000000000[/tex]

[tex](6.02 \times 10 {}^{20})(7) = 4214000000000000000000[/tex]Scientific notation:4.214x10²¹

2.

[tex](9.4608 × 10 {}^{9} )(3) = 28382400000[/tex]

Scientific notation:2.83824 × 10¹⁰

Step-by-step explanation:

  1. There are 4214000000000000000000 atoms in 7 moles
  2. There are 28382400000 km this star far from the earth