What number of molecules (or formula units) are present in 7.38 g of each of the following compounds?  molecules =   = molecules (NH4)2Cr2O7= formula units

Use the References to access important values if needed for this question. For the following reaction, 26.8 grams of sulfur dioxide are allowed to react with 6.14 grams of water. sulfur dioxide(g) + water (1)→ sulfurous acid (H₂SO3)(g) What is the maximum mass of sulfurous acid (H₂SO3) that can be formed? g What is the FORMULA for the limiting reactant? Mass= What mass of the excess reagent remains after the reaction is complete? Mass= Submit Answer b.0 g Retry Entire Group Show Hint 8 more group attempts remaining Previous Next> Save and Exit

(0)       Mass of FeCl2 (g) Volume of KMnO4(mL) Molarity of KMnO4 Trial 1 1.9986 33.81 0.0185 Trial 2 2.0237 32.33 0.0185 Trial 3 2.002 33.58 0.0185 The molecular weight of FeCl2 is 151.91 g/mol.   In this assignment, you will determine the mass % of an unknown sample of ferrous chloride (FeCl2) by titrating it with a KMnO4 solution of known concentration. 11. What is the average % iron in the unknown sample using your best three answers?

The chemical formula for chlorophyll is C₅₅H₇₂MgN₄O₅. a) What is the molar mass of the compound? Provide an answer to two decimal places. b) What is the percent by mass of carbon in the compound? c) What is the mass in grams of chlorophyll that are in 2.185 moles of the compound? d)What quantity in moles of chlorophyll are there in 2.185 grams of the compound?