Check what i have and
what is the mass, in grams, of a sample of 6.12 × 10^24 atoms of manganese (mn)? show your work or explain the steps that you used to determine your answer.

what i have:
[6.12 x 10^24 atoms] / [6.02 x 10^23 moles/atoms] = 10.2 moles mn
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Which describes interactions between substances and stomata during photosynthesis? check all that apply. oxygen enters stomata. oxygen is released through stomata. carbon dioxide enters stomata. carbon dioxide is released through stomata. hydrogen enters stomata. hydrogen is released through stomata.

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н,о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.