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For instance, when finding mass ratios I would divide an assumed amount of Hydrogen by its atomic weight; should I divide by 1 or its actual weight of 1.007 (I've seen both actions performed in a discussion)? These questions tend to deal a lot with assumptions so insight would help me a ton.
It is best to round by the end of the problem and keep the precision of numbers during the problem to reach a more accurate answer. If you round too early, you might get a slightly lower or higher answer than what is correct. I would keep it at 1.007 for the sake of accuracy.
Yes, I agree! When finding the molar ratio, I would utilize the most precise atomic mass of all of the different elements. This will ensure that your answer is as close to accurate as possible. Once you complete this, then rounding or considering significant figures is necessary.
in response to how to know how many sig figs to use in the end, you should use the question in order to determine the number of sig figs in the end. So if the question gives 3.48 grams then your final answer should be 3 sig figs because that's how many sig figs the question had
Agree with the above! Rule of thumb is to round your answer only at the end to get the most precise and accurate answer. Otherwise, errors might be carried throughout the steps and affect your final answer.
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