Pipets used for transfer of samples of solutions are always rinsed with a small portion of the solution to be dispensed with the pipet before the actual sample is taken. Calculate the percentage error likely arise in an experiment if 1-mL, 5-mL, and 10-ml pipets are used for transfer and each pipet contains 5 drops of liquid adhering to the inside of the barrel. Assume a volume of about 0.05mL per drop.

Chemical formulas can be written as empirical formulas, molecular formulas, or structural formulas. Explain why these different forms of molecular expression are necessary.

1. A compound (molar mass= 324.41 g/mol) is used as a cardiac depressant. It has this percent composition by mass. 74.04% C; 7.46% H, 8.64% N; and 9.86% O. Use these data to determine the empirical formula and molecular formula of that compound. 2. Give the family name (i.e noble gas, halogen, alkali, or alkaline earth metal) for the following elements: I) Calcium II) Bromine III) Potassium IV) Barium V) Neon

How many H atoms are in one formula unit of (NH₄)₂SO₄?

Calculate the molecular formula for the compound found to have the following elemental composition by mass: 40.0% C, 6.71% H, 53.3% O. The molar mass of the compound is 90.08 g/mol.   I'm confused what to do next after acquiring the empirical formula mass.

Write the correct chemical formula.

Consider the mixture of propane, C3H8C3H8, and O2 Write a balanced equation for the combustion reaction that occurs between propane and oxygen.

write formula out. balancing not needed 1. tin (II) dichromate + lead (IV) sulfate -->

The chemical structure of lactic acid (C,H,03) is shown below. Highlight each atom that is in a hydroxy group. H :0: ? Н —О C C -0. - - .. Н —с — Н H :0 :

47.00 g sample of MgCO3.XH2O is heated to move away the water. After that, the total mass was reduced to 22.74 g. Determine the formula of the hydrate. Show your calculations.