- How do I plan this experiment?

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How many moles of NaHCO3 are present in 38.4 g of HCl? Is it possible to make a glass which is transparent from one side but a white wall on the other side? Chem 100 question help please ? A fair coin is tossed four times. What is the probability that the sequence of tosses is HHHT? ? Can someone help me if this is correct? (Trigonometry) ?