\({\%~of~an~element} = \frac{mass~of~an~element~in~the~compound}{relative~formula~mass~M_r} \times 100\) There are six atoms of hydrogen in the compound, so the mass ...

Body Mass Index, or BMI, is an index used to determine healthy body weight. But, calculating BMI involves a complex formula, and then charts or online calculators are needed to convert the BMI ...

To calculate the mass of a higher number of moles, or even calculate the number of moles in a certain mass, a formula triangle can be used. Using the formula triangle is straightforward. Simply cover ...

The current BMI calculation gives tall people the short end of the stick, an Oxford mathematician says. Body mass index, or BMI, has long been used as the quickest measure of whether a person’s weight ...