Determine the number of moles of H in each sample.(a) 4.67 mol H2O (b) 8.39 mol NH3(c) 0.117 mol N2H4 (d) 35.8 mol C10H22

Be sure to answer all parts. TCDD, also called dioxin (C H,Cl,O2, molar mass 322.0 g/mol), is a potent poison. The average lethal dose in humans is estimated to be 3.0 x 10- mg per kg of body weight. (a) How many grams constitute a lethal dose for a 91-kg individual? (b) How many molecules of TCDD does this correspond to? (a) X 10 g dioxin (b) x 10 molecules

If you have 2.00x10^12 atoms of an element and it weighs 3.94x10^-10g, answer the following questions:  (1) The molar mass of the element to one decimal place is what g/mol. (2) Based on your molar mass the chemical symbol for the element is ?

Mass of 0.1 mole of methane is (a) 1.6 g (b) 0.1 g (c) 1g (d) 16 g

Calculate the number of moles (of molecules) in the following samples. (A) 3.84 g H₂O 0.213 mole (B) 21.92 g benzene, C6H₁ .28 mole (C) 28.00 g ethyl alcohol, C₂H5OH .608 X mole (D) 3.38x1024 molecules CO₂ 5.612 mole (E) A sample of CO₂ that contains 5.16x1022 O atoms X mole

A hydrocarbon has a MW of 114 g/mol and has a composition of carbon 84.06% and hydrogen 15.94%. What is its (a) empirical formula (b) true formula? Enter the empirical formula in the first box and the molecular formula in the second box. Enter the elements in the order of CH with the appropriate number for each element. If only 1 of an element is necessary leave the 1 off. Example: C6H12O6 If only one of a particular element is needed DO NOT type 1. Example: CO2 NOT C102

(b) How many molecules are in a snowflake containing 3.00 x 10-5 g of H2O answer in molecules (c) a 500. mg tablet of vitamin C, C6H8O6 NOTE THE UNITS OF mg. answer in molecules(d) how many ATOMS are in the vitamin C sample in part (c)?answer in  ATOMS(d) how many ATOMS of oxygen are in the vitamin C sample in part (c)? answer in atoms

(c) 193.0 g of chlorine dioxide, ClO2 mol