#include <stdio.h>
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#define MOL_MASS 3.0e-23
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#define WATER_QUART_GRAM 950.0
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int main (void) {
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float quarts;
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printf("Enter a amount of water, in quarts: ");
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scanf("%f", &quarts);
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printf("Number of molecules: %.2e\n", quarts * WATER_QUART_GRAM / MOL_MASS);
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return 0;
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}
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