Hey so I've been having trouble with this question for a while. I know the answer has 5 significant figures but what I don't know is which one is correct. I tried a few methods to get to what I what but I just keep confusing myself. Can anyone give me a hand with this? I'm not asking for you to give me the answer I just need a little guidance so I can get it on my own please.
What is the correct answer using significant figures?
1.2x103 * 787=?
a. 9.44 x 103
d. 9.4 x 105
Stacey Warren - Expert brainly.com
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This is sig stuff is my only weakness with chemistry i really dont get it
also, is 103 supposed to be 10^3, like with a 3 in the exponent?
well, ok, first we just multiply the numbers together to get
now, the rule for multiplication is that: the number of sig figs in the answer = the lowest number of sig figs in the factors (I'll demonstrate)
1.2 * 10^3 has 2 sig figs (both 1 and 2 are significant)
787 has 3 sig figs
so the answer will have 2 sig figs because 2 is the smallest number of sig figs
thats where my first mistake was!
I put all of them together by accident
right, remember it's the smallest number of sig figs
so, we rewrite 944400 in scientific notation to get
9.44400 * 10^5
then round down to 2 sig figs
9.4 * 10^5