This is a Science Question~ Please help me... I will give?

Which of the following is a surface event that takes place during the rock cycle?
A. Erosion
B. Melting
C. Metamorphosis
D. Tectonic processes

The density of an unknown gas at 98°c and 740 mmhg is 2.50 g/l. what is the molar mass of the gas with work showed?

Consider the following reaction at equilibrium: c(s)+h2o(g)⇌co(g)+h2(g) predict whether the reaction will shift left, shift right, or remain unchanged upon each of the following disturbances. a) c is added to the reaction mixture. b) h2ois condensed and removed from the reaction mixture c) co is added to the reaction mixture d) h2 is removed from the reaction mixture.

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %