What is the coefficient in front of H2O when the following chemical equation is balanced?     C3H8 (g)  +     O2 (g)​  ⟶       CO2 (g)​   +     H2​O (g)

Found in yogurt, sour milk, and produced in muscles during exercise, lactic acid has the chemical formula C3H6O3.  What is the mass % of oxygen in this molecule?

How many oxygen atoms are in 3.00 mol of N2O5?

How many hydrogen atoms are in 0.250 mol of C6H12O6 ?

Important for the immune system, Vitamin C has the chemical formula C6H8O6. What is the mass % of oxygen in vitamin C?

A small organic molecule being studied as a sulfur-based drug was analyzed. The elemental analysis in mass percentage gave:  38.7% carbon (C) 9.70% hydrogen (H) 51.6% sulfur (S) What is the empirical formula of this compound?

A coffee-fueled study group consumes a total of 388 g of caffeine (C8H10N4O2). How many moles (in mol) of caffeine they have consumed? Hint: molar mass of C8H10N4O2 is 194.22 g/mol

Tums® tablets contain calcium carbonate (CaCO3), which neutralizes stomach acid (HCl). The balanced reaction is:  CaCO3 (s)  +  2 HCl (aq)  ⟶   CaCl2 (aq)  +  H2O(l)  +  CO2 (g) If a patient has 0.200 mol of stomach acid (HCl) to neutralize, and enough Tums were taken to completely neutralize it, how many grams of CO2 gas are released? Hint: molar mass of CO2 is 44.01 g/mol

Which of the following is/are considered to be a weak electrolyte? CH3COOH (aq)  NaNO3 (aq) C6H12O6 (aq) HBr (aq) NaCl (s)  

In DES, the first step of driving subkey is to perform the Permuted Choice One (PC-1) defined in Table C.3(a). For the following 64-bit key, perform the PC-1 to reduce it from 64 bits to 56 bits.       1 1 1 1 1 1 1 0       1 1 0 1 1 1 0 0       1 0 1 1 1 0 1 0       1 0 0 1 1 0 0 0       0 1 1 1 0 1 1 0       0 1 0 1 0 1 0 0       0 0 1 1 0 0 1 0       0 0 0 1 0 0 0 0