A chemist wants to prepare 0.540 M HC1. Commercial hydrochloric acid is 12.4 M. How many milliliters of the commercial acid does the chemist require to make up 1.40 L of the dilute acid? Submit Answer Try Another Version 10 item attempts remaining

[References] A person drinks 1.64x10 g of water per day. How many moles is this? n(H,O) = mol %3D Submit Answer Try Another Version 3 item attempts remaining

Test this weekend, these are some questions I'm struggling with. Checking back in my lessons now! 1. What is the empirical formula of an oxide containing 49.5% manganese? (Hint: Oxide = compound of Mn with O).   Mn O Mass of element (in g) (assuming 100 g of compound) 1._49.5_ 2._50.5_ Moles of element 3.______ 4.______ Moles of element/Smallest moles 5.______ 6.______ Multiplier 7.______ 7.______ Empirical formula Mn2O7     2. What is the empirical formula of strontium chloride in problem 5?   Sr Cl Mass of element (in g) 1. 2.21 2. 1.79 Moles of element 3.______ 4.______ Moles of element/Smallest moles 5.______ 6.______ Multiplier 7.______ 7.______ Empirical formula SrCl2   3. What is the empirical formula of an compound containing 0.830 % H; 45.8% Mn; 53.4% O?   H Mn O Mass of element (in g) (assuming 100 g of compound) 1._0.830_ 2._45.8__ 3._53.4_ Moles of element 4.______ 5.______ 6.______ Moles of element/Smallest moles 7.______…

O CHEMICAL REACTIONS Finding chemical formulae from a mole ratio An unknown compound has the following chemical formula: PbOX where x stands for a whole number. Measurements also show that a certain sample of the unknown compound contains 7.70 mol of oxygen and 3.8 mol of lead. Write the complete chemical formula for the unknown compound. 0 Explanation Check 00 X S zz McGraw Hill LLC. All Rights Reserved. Terms

A sample of limestone and other soil materials was heated, and the limestone decomposed to give calcium oxide and carbon dioxide. CACO3 (s) Ca0(s) + CO2(g) A 6.748 g sample of limestone-containing material gave 2.63 g of CO2, in addition to CaO, after being heated at a high temperature. What was the mass percent of CACO3 in the original sample? % Submit Answer Try Another Version 10 item attempts remaining