0.07g of a gaseous hydrocarbon occupied a volume of 56centimeter cube at s. t.p. on analysis, the compound contains 14.29% hydrogen by mass. what is the molecular formular of the compound?

Explain which group an element with the electron configuration 1s2 2s2 2p6 3s2 3p6 3d1 4s2 belongs to.

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?