- How many grams of CaCl2 are needed to prepare 0.250 L of a 1.56 M solution?

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Can someone help me solve this math problem:? An arithmetic series has first term 1000 and common difference -14. Calculate the value of the first negative term of the series.? Actuary exam? What's the fastest we could put a saellite into orbit at the nearedt star system? I need help with this math problem it seems simple but im confused.?