Someone please help: 5.2cm^3 of gaseous hydrocarbon were exploded in excess oxygen. After cooling to the original room temperature and pressure a contraction in volume of 15.6cm^3 was observed. A further contraction of 10.4cm^3 was noted after treatment with concentrated KOH. What is the molecular formula for the hydrocarbon?

During which time interval does the object travel approximately 10 meters

As you watch a surfer ride a wave towards the shoreline, what is the shoreline? a) displacement reference b) reference point c) coordinate plane d) cartesian boundary

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)