How many moles of O are in 2.45 moles of H2CO3?

(5 points) For full credit solve show your work for this question in a clean piece of paper, include question #, full set up, units and significant figures. The correct answer alone (no work shown) is worth up to 1 point.    Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride (MM = 146.07 g/mol) according to the reaction below.                                  S (s) + 3F2 (g) → SF6(g) . a) How much of SF6 (in g) can be produced from the reaction of 3.5 g of sulfur with 4.5 g of fluorine? b) Identify the limiting reactant. c) What is the percent yield if only 4.7 g of SF6 are formed?.    Enter your final answers below: a)[ans1] b)[ans2] c)[ans3]

(5 points) For full credit solve show your work for this question in a clean piece of paper, include question #, full set up, units and significant figures. The correct answer alone (no work shown) is worth up to 1 point.    What mass of oxygen (in grams) is consumed by the complete combustion of 25.0 grams of acetylene, C2H2?                                                                                                                                        2 C2H2(g)  +  5 O2(g)  → 4 CO2(g)  +  2 H2O(g) Compound Molar mass, g/mol C2H2 26.04 CO2 44.01 H2O 18.02 O2 32.00    Enter your final answer in the box below:

Identify the atomic element.

(5 points) For full credit solve show your work for this question in a clean piece of paper, include question #, full set up, units and significant figures. The correct answer alone (no work shown) is worth up to 1 point.    In the reaction below how many moles of carbon are needed to produce 66.0 g of carbon monoxide?                        2 C + O2 → 2 CO   Enter your final answer in the box below:

Identify a true statement about cultural differences in friendships.  

What initially motivated the exportation of U.S. popular culture?

Which statement is FALSE about how people think about or use popular culture (and information about cultures)?

When the lung collapses without injury or any other obvious cause, it is called which of the following?

You are treating a patient with a possible fractured ankle. The patient appears to be in a lot of pain and is uneasy. As you are getting ready to splint the patient’s leg, he asks you if it is going to hurt. Which of the following is the best response?