Welcome to YESOTA CHM101 QUIZ 4
Overview:
This is a Test Simulator, we advise you to see yourself as being in the examination hall and avoid cheating.
Date: March 10, 2025
Duration: 15 minutes
No of Questions: 10 Questions
Course: CHM101
Instructions:
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1.
CHM101
Copper oxide reacts with sulfuric acid to make copper sulfate and water. In an experiment, 17.6 g of dry copper sulfate crystals are made. If the theoretical yield is twice the atomic mass of Beryllium, calculate the percentage yield of copper sulfate.
2.
CHM101
16cm³ of a gaseous hydrocarbon were mixed with 90cm³ of oxygen. After explosion and cooling to the original temperature and pressure, the volume was 66cm³. It was reduced to 34cm³ of residual oxygen by absorption. What is the molecular formula of the hydrocarbon?
3.
CHM101
An organic compound is made up of carbon, hydrogen and oxygen. Combustion it 6.38g of it gives 9.06g CO2 and 5.58g H2O. What is the molecular formula of the organic compound given that it's vapour density is 1 less than the atomic mass of sulphur [H=1, C=12, O=16]
4.
CHM101
10g of hydrated calcium tetraoxosulphate (VI) [CaSO4.xH2O] weigh 7.9g after heating and cooling. Calculate the empirical formula of the compound. [CA=40.0, S= 32.0, O=16.0, H=1.00]
5.
CHM101
Consider the reaction below. What mass of O2 will be needed to burn 36.1g of B2H6? [B=10.81, O=16, H=1]
B2H6 + O2 ----> HBO2 + H2O
6.
CHM101
What is the percentage yield of water if 0.95g of water is obtained when 29.0g of butane is burned in excess oxygen?
7.
CHM101
A certain oxide of nitrogen contains 30.43% nitrogen. The molecular mass of the compound as determined by mass spectrometry is 92. What is the molecular formula of the compound? [N=14, O=16]
8.
CHM101
What is the formula of an industrial raw material whose composition is 28.1% Fe, 35.7% Cl and 36.2% water of crystallization. [H=1, O=16, Fe=56, Cl=35.5]
9.
CHM101
In a certain experiment, 40.0gKClO3 is heated until it completely decomposes. The experiment is performed, the oxygen gas is collected, and its mass is found to be 14.9g . What is the percent yield for the reaction?
10.
CHM101
When 32g of CH4 is burned with excess oxygen, how many grams of CO2 are produced?
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