# Posts by nelia

Total # Posts: 5

**Maths**

The sum of 2 numbers is 21 one of the numbers is 9 what is the other number

**Chem**

upon cumbustion of a 0.144g sample of Mg, 0.090g of O2 is used. Though the sample likly contains impurites (substance other than Mg). What is the percent of imputities by mass?, please show the steps I'm really confused with this one. Thank you

**chemistry**

upon cumbustion of a 0.144g sample of Mg, 0.090g of O2 is used. Though the sample likly contains impurites (substance other than Mg). What is the percent of imputities by mass?, please show the steps I'm really confused with this one. Thank you

**chemistry**

calculate the mass of potassium hydrogen phthalate which must be dissolved in water to make 500ml of a 0.2000M solution

**math 5**

The date of the first Friday in November can be represented by thevariable F. Write an expression using F for each of the following dates in November. A. the first Tuesday B.the first Saturday C. the second Friday D.the third Friday

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