Chemistry Please Help 1. 2 As (s) + 6 NaOH (aq) → 2 Na3AsO3 (s) + 3 H2 (g)

If 26.2g of As reacts with excess NaOH at STP, what volume of H2 will be produced in liters?

2. SnO2 (s) + 2 H2 (g) → Sn (s) + 2 H2O (l)

What mass of water is produced when 49.4g of SnO2 is consumed in the reaction above?

3. C3H8(g) + 5 O2 (g) → 3 CO2 (g)+ 4 H2O (g)

What volume of oxygen is required to completely combust 0.531L of propane (C3H8) at STP?