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4. calculate the molar masses of the following chemicals. be sure to show all work and indicate your final answer with a circle or box.
a. cl2

b. becl2

c. (nh4)2so4

d. k2(no3)

5. given the number of moles of each find the number of grams of each.

c. 21.5 moles of sodium carbonate

d. 6 moles of hexane c6h6

6. given the mass of each substance in grams find the number of moles of each:
a. 10 grams of hf

b. 1.2 grams of fecl3

c. 12.7 grams of co2

Calcium hydride (cah2) reacts with water to form hydrogen gas: cah2(s) + 2h2o(l) → ca(oh)2(aq) + 2h2(g) how many grams of cah2 are needed to generate 45.0 l of h2 gas at a pressure of 0.995 atm and a temperature of 32 °c?

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

No copying 15 pts how does a free-body diagram tell you about the net force on an object?