A sample of seawater with a mass of 1 kg contains 6 x 10-ºg of gold. How many atoms of gold, to one significant figure, are there in 1g of this seawater?
[A, value: Au = 197 Avogadro constant = 6 x 1023 mol-']

A. 2x10^10
B. 4x10^12
C. 2x10^13
D. 4x10^15

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you gotta add the following molecules so we can give u an answer

explanation:

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.