What is the total number of moles of Ca(NO3)2 needed to make 7.3 liters of a 5.1 M Ca(NO3)2 solution?
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May someone me with these science questions

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon