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In a 7.812 g sample of CaCO3, 3.125 g is calcium. Calculate the percent composition of Ca in the sample

When an unknown solid was added into a volumetric cylinder with 25.00 mL of water, the new volume came to 55.00 mL.  If the mass of the solid is 81.00 g, find the density of the unknown material.

Do the following calculation and write the answer in proper number of significant figures 45.56 – 40.34

Identify the name of the following molecule CO2

A student obtained 26.49625 g for a sample of sea water. If the volume of the sample is 25.85 mL, find the density of sea water 

Identify thenumber of significant figures in thefollowing number 56.01058

Which of the following shows the balanced equation for  Copper(II)oxide with sulfuric acid

Identify the name of the following molecule Mg(NO3)2

Identify thenumber of significant figures in thefollowing number 56.0560

Calculate the heat of reaction for 50.00 mL of 0.400 M CuSO4 at 22.5 Celsius that is mixed with 50.00 mL of 0.600 M NaOH at 22.5 Celsius. After the reaction occurs, the final temperature of the mixture was 24.75 Celsius. The density of this mixture is 1.02 g/mL and assume the reaction is run in water. [The specific heat capacity of water is 4.184 J/(gxCelsius)] Heat = mass x specific heat x change in temperature