How many grams are there in 3.4 x 10^24 atoms of He?
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2.07
5.7 g...
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Which of the following units is not an official si unit? mole liter kilogram ampere
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State one important difference between a physical change and a chemical change?
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What is bromine+calcium iodide--> calcium bromide +iodine balanced
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Chemistry, 23.06.2019 02:00
Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium
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